If you have the aileron servos on different chanels you can use flap trim to lower them both slightly during flight and experiment.
Just a thought.
BTW, by dropping both ailerons the nose will pitch down-depending on the amount of aileron drop. Be prepared to add a little up-elevator trim when you do it.
At least that is what I have found happens.

Jeff

OOps! Sorry. I just noticed you specified positive angle. The nose may pitch up instead.