smoothpass,

I don't know if a flying buddy's experience with a Cap232 (ARF) will be of any help. He experienced problems quite similar to yours. We tried all that you have, as well as all of the great suggestions in the other replies provided here. None of this worked. Then, purely by luck, while we were checking wing/stab incidence angles for the umpteenth time, he thought he saw that the left half wing thickness was greater than the right. We immediately got out the measuring tools and found almost 3/8 inch thickness difference (at max thickness point) between left and right at the fuselage sides, and 1/4 inch difference near the tip.

He contacted the manufacturer of the model (I apologize that I don't remember which one) and they sent a replacement. With the new wing the plane flies beautifully!