To get the most of your servo and radio set the max possible trow I think the DX is good for 125 the reason is that the resolution and torque of servo are calculate at max deflection.....so to get all the torque and all the resolution you need max trow of the servo.....then set the surface mechanically to what ever max deflection it's called for in the manual (as a starting point) the set the trow in the dual rate or flight mode which I prefer.....set the expo + plus for JR/Skeptrum - for Futaba...don't be afraid to used the radio to do the mixing that is why we now have these computer transmitter.