forestroke

I have just finished my WM Rambler 30 and it's a beaut! Trouble is the YS 63 I have in there is just too powerful. I can have unlimited vertical at less than half throttle. When I go do the vertical test (which I always always do) I'm too scared to do it at full throttle. Instead I use slightly less than half and it already wants to fly out of my hands. And, of course, when I fly the plane is always rolling one way or the other because I can't trim it as the tendency to roll left increases with more throttle.

HELP!!!

For the time being, I am flying with EPA at some sad percent so that I don't by accident throttle up too much and roll into the ground at low altitudes.

Would a larger prop with lower pitch work? Or a three bladed prop? I am using a APC 12 x 6 now. What if I just use an 11x6? Are there any risks for underpropping a plane?

Thanks!