I'm doing the same thing Alan, using a 20lb and a 40lb weight for practice rather than the full weight implements. The lighter weight lets me get more reps in without wearing out, and it helps me work on speed and footwork, rather than having to muscle the weight.

It's working, though I still have a lot of problems getting the double spin down. As good as I was in Prescott is how bad I was at the USS Games the next week. I need lots more practice.