Hi, my plane also turns right. aileron trip I ineffective. The Brittain B4 AP has a wing leveller which also see permanent left aileron input.
I noticed that the left aileron is not in line with the trailing edges of the flap and with the wing tip. In flight it is showing a slight drop at the flap side which induces the right wing low attitude and the turn.
I will try first with trim tap setting and than by rerigging.