The reason for the higher voltage is because servos move faster at higher voltage. With them moving faster, the effect will be to get rid of the rough ride more quickly. Giving a smoother ride.
The AVC output is a modification of the pulse width going to the servo from the transmitter. It's not a "3.2V signal" except that the signal going to the servo is already a 3.2V signal.
If by "push" you mean that it will want them to move faster, yes. The greater "push" actually comes from changing the frame rate to the servo. Be sure your servos can handle the high voltage and high refresh rate!
Andy
Spektrum Development Team
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