What should I do with aileron reversal?
Yes, this is dangerous and must be avoided.

Consider this: Between the low speed range where the aileron works as intended and the high speed range where it works like a Flettner flap there is one speed point where the rolling moments of the aileron and the wing twist cancel each other out. There the aircraft is uncontrollable in roll. No sane pilot would fly such an aircraft voluntarily.

Set the speed at which full aileron deflection produces only a quarter of the rolling moment coefficient as the never exceed speed.