OK I've had about half a dozen proper, planing, committed, full speed attempts, and all of them end up the same way:

On a 5m wavesail, 80 litre waveboard, well powered up (20-25 knots windspeed), I hit the ramp doing 90 degrees to the wind, look back, sheet in, and the sail gets ripped out of my hands.

The last time I landed upside down with my feet still in the straps, watching the sail doing rotations without me. I've done the remko method of wymaroo's, non-planing rotations and boardless rotations in light wind, no problems there. But I'm stuck when it comes to doing it full-scale

Any ideas? Do it hooked in? Bear off more so there's less apparent wind? Manacle myself to the boom? Htfu?

Help?