Pinky - one way to make PUB harder is to do it the body for life style. I do this all the time. Basicly when Cathe starts to go down in weight you go up. and then only go slightly down for the last set of 12. I do reps like this 12-10-8-6-12 where Cathe does 12-10-8-10-12. I also add extra sets/reps on the shoulders and biceps where she seems to go too slow.
What kind of rotation are you doing w/HC & S&H. Are you seeing good results? I am tempted to try something similar. I love the GS workouts!