td,

What is your system pressure? What is the vertical height difference between your water connection point and the water exit from the head? Since these are commercial rotor type you might try a smaller screw-in nozzle to reduce the pressure loss at the head and then run the head a longer time. Also are these new heads, return them after you checking the first two questions I asked. JMHO Aloha

static pressure is 65 psi. The design pressure is 30 psi. Not quite sure on the exact height, but I would guess about 2-3 ft from the valve and probably another 1ft or 2 from the main.
Looks like the specs on this head are operating pressure of 40-60 psi. Do I base that off the design pressure or static pressure? So if I replace just the NOZZLE, I can compensate for the pressure loss at the heard? hmm I will try that.

I get these heads rather cheap, so I will probably keep it and possible place it in one of the more lower lying area, if I cannot get it to work in its current location.

Thanks