+1 for the correct edging in takeoff. If you do not make the last kick to upwind just when you are taking off, you will rotate forwards. If you turn too much upwind, you will rotate backwards (this is how you can initiate backwards rotation in takeoff). If you could see your track on the water (like you can see it on snow), your track would end to a short kick to upwind and would look like a Nike logo.

Bonus is that when you nail the edging and takeoff, you will get more hight for your jump.

thanks for the pointers guys, good points in all.
i kite in shoreham england, so im always in waves and to start with ive been using the waves launch off,
i have been using a 125 lite wave TT (which is brilliant in flat water and really stiff), but recently bought a 132 f-one skate and my riding has improved drastically,
im thinking its probably a combination of the wave tipping the board and not learning back far enough just before and after the launch, plus my head direction.

mind you its not happening all the time just occasionally, but i am looking at the techniques for a back and front roll now so may help, ya never know

keep the jumps tips coming if anyone else has any probe or tips