Of all the steps in your videos that I've seen, the only one with which I have difficulty is the A-Step. This only happens when I'm doing it quickly, but my tendency is to dig in my heels as I reach the point of the "A" and the motion becomes more vertical than horizontal and it's hard to balance. As a result, my form looks nothing like yours. Since I'm almost exactly your size (a fraction under 5'2"), my short legs don't offer me an excuse. Do you have any suggestions?