I agree with Angela. I've only done the whole pyramid and the "pyramid up"." I once read an article by a body builder who suggested doing pyramid down (start with fewest reps, then increase reps), but not decreasing the weight (so it is hard to think of it as a pyramid "down"). That way, you use the same weight throughout, but increase reps each set. I did PUB that way, starting with the "middle" weight that I usually use. It was a nice change.