It seems that I get less pressure at the sprinkler at the end of zone--farthest from control valves--leaving an area with less water distribution. How can I be sure of equal pressure at all sprinkler heads?
While I'm not so sure about rotors, if you have spray bodies and a little extra working pressure, you can get spray bodies with 30psi pressure regulators built into them. This was my solution for a system that starts with about 70psi static water pressure using MPRotators.