Your wasting your time trying to add ailerons to that thing. It flys fine for what it is, a two channel rudder only airplane. In the early days of this hobby thats all there was. The problems you are having are caused by you overusing the rudder. I'm not going to go into a lenghty discussion about rudder only designs, just use short rudder inputs, dont hold the rudder in eithr direction for too long and the plane will fly fine.

rrragman