When edging fin size makes no difference to grip levels, just help you to control that grip.

With the board flat it will affect the grip levels.

Hi Campatrol,iv recently gone from shorter fins to 52ml fins.I find the 52ml fins make it heaps easier to land tricks but harder to purposely pop the board out sideways to do surface slides,thats pretty much all i have noticed.

hi jas73,next time i go for a kite il take a short vid of myself doing a surface slide and send it to u but for the mean time il try to explain it to u.if your going left foot foward heading straight cross wind you break tracktion by pushing your back foot foward and bringing your front foot back so you have rotated 90 degress anti-clockwiseand are sliding sideways,you can rotate an extra 180 degress so you are slidind side ways with the other side of your board and your back facing the direction of travel(at this stage your veering off down wind a bit).you can hold this slide for a while(i can slide for about 20 or 30 meters before having to rotate back because of los of speed) and its not that hard to learn.ther are varyations like poping and rotating 270 and land sliding with your back facing the direction of travel and drag a hand on the water.i only do these slides hooked in.
hope this helps but il send a vid as its the esiest way to understand a trick.
sory bout the crap speling and grammer.
cheers ray.

I hope this works.