RE: Number of sets for different rep ranges....
I'm following 5x5 at the moment, but I'm trying to design a beginers program for a friend who will train about 3 days a week. So maybe it would be better to use the following split
chest+tris, back+bis and legs+shoulders
I think as you say a push-pull program with 3x8 would not be ideal, and seems more geared towards 5x5