RE: JR DS 8231 for ailerons?
Have you bought the DS 8231s ??
If you haven't bought the Servo yet and JR is more your taste then I would go with the DS8411.
if brand doesn't matter I would consider the ATX 94773M 194oz 0.12 speed @ 6v makes for a great servo for ailerons. Thats what I run and I am very happy with them.