Well you see that's the problem with those extra wide strops. I had the very same strop and I didn't like it. They do tend to cup. The amount of slack you are using is really way too much however obviously you have mastered using it that way and it works for you so thats fine. However I think if you used a standard strop that way you might have problems or maybe I should say most people would have problems. As we say whatever method you use if it works for you its proper.