Well, I was thinking that since I can pull water from 2-1.5" lines and distribute via at least 2-1.5" lines (albeit through 1.5" valve) that putting 2" plumbing may be beneficial. It all works fine now but since I have to replumb anyway I thought I'd consider it but if it's going to cause problem then forget it.

FWIW, I will be putting in a 3/4 HP Whisperflo that moves 70gpm.