Well, are you talking about level trim on both sides? Meaning, are both sides set up with the same "trim"?

Why not make them center and neutral, as though they were a straight extension of the trailing edge? Then you can dial in whatever trim you need.

The elevator is going to move the nose, not the ailerons. If one aileron is off more than the other, well, you will get a slight roll tendency, not a nose up or down attitude.

CGr.