5 x 3 to extend NLP program question
I've recently got back into where I am assuming is the back end of my NLP. (previous maxes: 135 squat, 105 bench, 180 dead, 63.5 press) and I've found that going to a 5 x 3 is a good way to extend the program (as well as micro jumps).
I consulted the blue book to double check what I was doing programming wise, and realised that it only references micro loading at the end of the NLP as a technique to extend it. I obviously mis remembered reading that switching to 5 sets of x 3 reps was in the blue book.
My question is if it's not from the blue book, where did I pick it up from? I know it's mentioned plenty of times on the forum for various reasons. Is it just one of those silly things people say that I've picked up? or is it a "proper" technique to extend the NLP?
Is it a worthwhile technique to continue or should I go back to 3 x 5 and utilise micro loading as the only extension technique?