I still have this incident problem. I meassured everything even with the incident meter but I still have to move the left Ail 5mm down (right 5mm up) to get a straight flight.
Never had a plane before with such a bad behaviour. Now I have in mind to correct it by moving the back fixing hole (towards tail) of each wing to have this missmach corrected.
But this means that the left wing will be about 2-3mm lower then the right wing having the canopy surface as a reference. Hopefully this will improve the flight conditions.

Could it be that the wings are a little bit twisted? If that is the case what kind of corrections are recommendable ?

By the way the elevators are in the correct positions.

Rgds

Bruno