It's probably one or both of two things:

1.) yes over powered - usual depower system should adjust this
2.) If you're leaning forward to push the bar out, you may be doing the 'poo stance' rather than leaning back against the power and edging effectively. You should be able to control the power by leaning back and edging (digging in your back foot hard). If you're doing this and still being pulled off your edge (so you fly feet first over the water) then you're def over powered.

Best way to check is : 1. see what everyone else at your kite beach is flying that day, and your kite should be no bigger than what they're flying (especially given your lean 70kg). 2. Fully depower the kite via the straps on the the depower system, try a water start. If you're under powered, add a little more power on the straps, and repeat until you've got the right power. I.e. start off with insufficient power and dial it in, rather than starting over powered, and taking the power off.

Good luck.

Long story short - stance (form) is the key to good board control is the key to kite control is the key to handling more wind.
Start here - www.iksurfmag.com/issue5/?t=Stance-2007-Kitesurfing-Technique&page=49
Then trim the kite to ensure that you can ride with good form without being yanked off your edge. Easy

Short story long . . . kiting is all about trim

Dealing with the power of a kite requires board skills. No really! (And I'm shocked nobody has yet said "I remember when kite bars had 3 inches of throw and we had to use the board to handle gusts" . . . or 2-line kites!)

I want to geek a bit and moan about when people talk about the trim system and the state of your lines as "over-powered". It's not a depower system, it's a TRIM system; you should be tuning your kite for optimal Lift/Drag performance, not thinking you've made the kite "less powerful". Your lines are out of spec or untuned, ruining the trim of the kite - not over-powering it. You're not depowering the kite, you're sheeting out and altering the Angle of Attack, to adjust the trim for optimal L/D. . . .
We're talking about the same thing, but words like "depower" give a false impression (especially of safety) . . . ask a pilot what he does with the control stick - he won't talk about "powering" the plane. We're doing the same thing with the bar.

First step, make sure your kite is trimmed correctly (which is more important than many realize); at the VERY LEAST (1) ensure your lines are the right relative lengths: most kites these days require the bar to be against the CL and the lines to be equal at the pigtails. Do this a couple of times a season under you get a feel for how much your steering lines shrink (NOT center lines stretch )

Then (2) trim the kite on the beach when you launch . . . a little more tricky and not something I believe I've learnt well. Essentially, the kite should be altering it's Angle of Attack (what you actually do by sheeting the bar in and out - NOT powering/depowering the kite!!!) without distorting the tips when you sheet in.
And remember, as Uncle Plummet has said - if you have to trim the kite to cope with the wind strength, get a smaller kite

Next, kite and board selection, it's all relative to weight and preferences . . . I'm fat and will often fly kites that are 100% or bigger than other people - I'm lazy, hate working kites, just like to park, ride and BOOST.
At your weight, as a beginner, select your kite & board on the day, for the recommended wind ranges by the manufacturer (then tune as you feel it needs to be. That feeling will change over time too )

So you're kiting with good power under a properly trimmed kite and . . . omg! a gust!

Use the board, Luke!

Last point is, board control. Edging hard against the kite drives the kite ahead, to the edge of the window where - do you remember? - the wind is actually weaker. You'll also go upwind at a higher angle so you'll feel less power in the kite and go slower! Get the kite down lower too, below 45 degrees so you can lean back against the kite and drive your heels into the water.

Sounds counter-intuitive, but try it out one day when you've got good water under you, distance from shore and other kiters. Concentrate on not moving the bar (easy if you're all trimmed right), then just lean back and edge hard. Watch the kite and feel what happens to your speed . . .

Now, why NOT just sheet out and luff the kite? Control. If you're balanced on the board (trimmed the board properly - OMG trim again!) and have good form, you won't loose your angle upwind, you'll have the kite under control, and you'll be riding under control, consistently. And then you'll have a margin of error for when things really go to hell . . .

To review . . .
trim system - not depower.
sheet in/out - not depower.
Tune your lines!
Tune your kite!
Choose the right gear for the wind strength.
Stance.
Use the board!
Control!

try a seat harness

Like they said
Drive your back foot in (can even pump it a bit) and edge until you feel yourself slowing down
Then you are in control

So let me ask you this.

The steering bridles on most kites, have three knots. The first knot I was told is for light wind days, the 2nd knot is the most commonly used for basic board riding, and the third knot (counting by the way from the end of the bridle line into the kite) is for pros with loops and jumps in mind. Is that right?
Also, on my kite at least, there are two connecting bridles along the LE. One set closer to the centre of the kite and another set further out, which is what the bridle lines were connected to when I purchased it. I have not tried the "inner" bridles. What are they for and what do they do? I suspect they alter the sensitivity to the AoA. The more centred the bridles are to the middle of the kite (or LE), the less AOA?

Let me guess airush, you're in a waist harness?

you're 70 kg so unless you're the skinniest dude around you're under 5'10" and you look more like paul mccartney than joey ramone when you play a guitar?

Get a seat harness, gives you more reach. When you start rocking waves or getting into freestyle comps change to an 'engine' harness, and also do what Kamikuza said.

Trim your kite.

Too much wind for your kite/ overpowered , last knot on your back lines. (if you're still overpowered - you need a smaller kite)
Not enough wind to get you rocking, highest knot on your back lines. (if it starts backstalling on this setting you simply need a bigger board or a bigger kite or both)

oibill said..

I have a question relating to my airush lithium 2010 10m...
Back ground :- been flying ozone 2007's 9m and 12m's without any problem since 2009 ..
Recently got a airush 2010 lithium and an analog bar. all new (ex stock)..

My Issue :-
When ive been flying the airush I find that it has so much more power than the 9m and feels alot less safe due to the amount of pull (both while walking up the beach or sitting the kite over head.)

I hadnt checked the settings on the bar until tonight until reading the above posts. I discovered the rear lines were set on the second knot down from the top knot next to the lines.

Would this make a difference a big difference ?...

I understand that if the rear lines are slacker this will alter the kites angle of attack. / Also by moving the power lines further down towards depower strap would take even more wind out the kite.

Should i play around with the bar settings..

Ps.. all the lines were new, but i havent checked that the line lengths are equal yet..

Should have mentioned, ive had to ajust the rear lines on the ozones and it doesnt seem to make a difference other than to the steering.. ie tightening the lines when they have stretched will stop the kite dropping out the sky and making it more difficulty to bring the kite back over head.. if you know what i mean.. The ozones use the 5th line to angle the kite..