How is the wash-in/wash-out of the wings?? Is the wing set up at 0 degrees? I had a Sukhoi that did the same thing but to the left and the left wing was at +3 degrees at the tip while the root was at 0 degrees. I warpped the wing and it flew way better.

How about the alirons, is one hanging down a little more then the other?

Just a few ideas.

Dru.