Hey Carl,
I'm with you on your technique and that's a fine way to go about it. I do much the same but, I do one direction a while and shift to the other, go back and forth heel, center and toe for a while and then some "X" motions. Often times my "X" starts to look more like a figure "8" than an "X" but that's usually when I get in a hurry. The idea is to get the leather rubbing diagonally across the edge to create more friction, I believe.

Regards

Chasmo