Maybe this would help? After test flying a full scale exp.
it was found the plane was dropping the left wing.
A call the the kit mfg. got this fix. (On the aileron of the wing
that is dropping the TE is most likly to sharp to maintain contact
in the slip stream. To fix it hold a 3' section of 2X4 on the TE
of the aileron and give it a few good hits with a hammer.
The idea is to remove the sharp TE and give it some thickness
to maintain contact in the slip stream.)
The owner tried it and it really worked.

I'd never thought of that one.