I would try tough sets of 5 that turn into 4s after a couple of weeks. Don't plan the reps, just add the weight, after a couple of weeks you will only get 4.
It also depends on the lift. I like the 5s for SQ, DL and BP, but I always do 3s on heavy bent-rows from the floor.
I also stick with lower reps on more technical lifts like snatches, clean pulls etc.
is this what your talking about?
also you said the 4-5reps were the strength building phase, so what was the purpose of the lower reps (1-3)?