The trick is really to get the green line as close to the middle under the ski's as possible, then you'll get a great jump.
After that, just try to get the best leveling posible, where the ski's are like ____ to get the best updraft. But don't level the skiier too soon, or you'll lose the height you got from the jump
I haven't found out the best leveling technique yet if it is ____ or just slightly tilted upwards on the right side, it seems to be a bit different if you have updraft or backdraft (red wind)