The last couple electric airplanes I've had, a Focus and a Genesis, have used 9650 on aileron. The servos center well enough to use for elevator, and at 6V they have enough torque at 62.5 oz/in... work great and very light. I have also gone to 9550s for elevator and rudder to save about an ounce over the use of full sized servos. Total weight savings is close to three ounces using those servos.

Tom