Victorian
The ailerons are differential so any adjustment will effect the effect in the turn and make the aircraft turn more quickly in one direction than the other, this is achived by the ineffective crank effect of the belcrank design so Aleron adjustment is not a good idea.
Adjusting the flap slightly has a very measurable effect on the aircraft in roll without effecting the ability to turn, of course it will have secondary effects in yaw and pitch but it is the best way to get the roll issue sorted.......as I said the first thing to do is go back to the book settings and then find out what needs adjusting to get the aircraft to fly S+L.