Sub 
I've not trained with Rip nor read any of his books. My experience has been that one must actually work with a coach, ;ive and in person to truly understand thier approach.
TAKU
If I'm going below parallel but my sticking point is somewhere between parallel and a bit above that, what is my problem? edit: Google tells me probably glutes/hamstrings.
I'm really trying to stick to the program. Rip and others who've been training people for decades seem pretty adamant that people who aren't "strong" don't need to mess with much or anything in the way of assistance, and in fact that it is counter-productive. They seem pretty certain that just working the main lifts will shore up the weak points. I'm trying not to just go off and do my own thing rather than stick with what is clearly tried-and-true, but if I'm struggling at that point, what choice do I have?