The intended PSI for the irrigation zones is 50 psi, so I was going to utilize a 40/60 pressure switch, with a small 5 gal pressure tank just to deal with leaks, but I don't ever have leaks...

This is intended to prevent pump-start-relay/no-valves-open problems (that I have run into before) I believe that combo boiled the water inside the pump and caused a lot of repiping and repairs on the pump's internals.
Thanks