I've just got a Trainer-style plane, almost finished, with a warped 70" wing. The front left side of the wing seems to be about 1/2" lower than the right side front. I'd like to fix it, because it seems to take all of my radio's aileron trim to keep it flying straight. Maybe more. Questions: 1) Is it better to have the front wing tips down or up? 2) In adjusting with a heat iron, is it best to start ironing on the bottom of the wing or the top? Any other suggestions?