That is a long friggin servo arm you have there!!!
What are your ATV's set at to get normal control throws on the ailerons?
JR lists the torque spec. for the 3301 as only 60 oz inches, this is less than 10 ounce inches more torque than their standard (527) servo (and I wondered why my Bobcat runs out of elevator sometimes ).

I would guess that with that long of a servo arm you had to turn the ATV on the aileron channel WAY down in order to keep the throws manageable, but this does nothing to control the actual force that is being applied to the servo.
A longer servo arm equates to more mechanical advantage that the control surface has over the gears (and the motor) in the servo. I would guess that for some reason the flight loads of your Starfire are just a little higher on the right aileron than they are on the left, and you have just been very lucky that you have only exceeded (more than once, it sounds like) the limit of what the right aileron servo can handle.
I would highly suggest that you shorten the servo arm length on both of the aileron servos (and any other similar "high load" surfaces) before your luck runs out.