I have a 1.5 HP pump and the gauge at the pump reads 90 psi. I have a large, open lawn area, which would take 72 Rainbird 5000 heads v/s 28 Rainbird 6504 heads. How do I know for sure that I can run (6) Rainbird Falcon 6504 rotors (with the 2.9 gpm nozzles, or next size up) per zone? I was planning on comming off of the 1.25" main line and using 1" zone line having 6 Falcons per zone. Should I use 1.25 zone, with 1.25 valves? I just wanna be certain because the materials will be delivered from a...