Thanks for your replies folks!
I am 85 kg and the kite I was talking about was 13.5 m. The problems, as I see them, are:
1. Lack of my experience. I am still learning how to work my kite to create an apparent wind and any advice on this technique will be invaluable;
2. We rarely have winds more than 15mph;
3. Even if we have stronger winds, they are very gusty, which, obviously, does not add to my stability on a board.
It is because of ## 2 and 3 I am thinking about getting a bigger board, which will allow me to get more of #1

. My assumption here is that this huge size board would allow me to get moving in winds as low as 10mph, which, in turn will provide for more practice time.
Yes, weebitbreezy, it is a micro leash indeed. I am going to replace it with a regular leash from my 9m Liquid Force kite. However, liking the small size of this micro leash, I would like to continue using it, but not with this ridiculous velcro strip. Any suggestions on a kind of carabiner I can use to replace the velcro?
Also, could anybody share their experience with relaunching the kite in deep water. While taking lessons, I only was taught to relaunch it in shallow waters. Last time I was able to get on my board and get running about 300-400 m, and even upwind (see, I am not completely hopeless

). Crashed in deep water and felt desperate trying to relaunch there. Using a board on my feet as resistance would help. Unfortunately, when you crash, you lose your board. To get to your board, you have to body drag yourself upwind. But how the hell you can do it without relaunching your kite? Any tips on how to do that efficiently?