After reading more about my situation on other forums I think I will leave it as is until I can upsize the main feed line to a 2" line.
If I reduce the nozzle size but add an additional zone with it's seperate 1" line it seems the pressure would rise but not significantly. The main concern I have learned is that by reducing the nozzle size I would experence a significant amount of wind drift to the water stream from the rotors. The area is windy most of the time and I need to stay with larger nozzle sizing to reduce the effects of the wind.
I'll just wait until the time I can increase the supply line and then redesign the rotors (number per zone and nozzle size) to fit the pump performance curve. A few of the zones have not only long runs but a significant elevation rise.