Well one of our 2nd don black belts said
that there is not enough power in my right fount
Kick. Because I was snapping it back to quickly,
and not extending it through the target. This was
during pad practice.
It depends on the type of kick, think of it like this: One is like trying to drive a log through something - thrust kick, the other is more of a "snap" that reverberates shock into the target. Using a pad, I cannot imagine trying the first kind of kick because pad simply won't work for it. For the second, honestly if you are unable to fully extend and that is the problem, not retraction.. just make your partner drop the pad until you can do it right, IMO.