3.3 to 3.7gpm for each head on the blue nozzles with 5heads holding at 42-44psi tells me you probably have a 15gpm pump already.
Usually sprinkler guys want 20gpm around here but your sprinkler guy should've done two things with that pump already in place.
1. Had you call the well installer to check what gpm your pump was and what it can do if your static water drops to design your system properly to that pump. The sprinkler guy could ask for more gpm after that.
2. He could've checked the gpm flow rate himself to know he should've stayed around 15gpm.
The data I provided was w/ the new pump installed; 1.5hp, 7gpm pump, 5 heads w/ blue nozzles results in 100% pump duty cycle and the system gauge showing 42psi. The gauge is just after the pressure tank and sediment filters.
The blue nozzles supposedly have a radius nearing 40' @ 42psi. Mine are nowhere near that. I suppose this is due to pump size (gpm), restrictions downstream due to system design, or a leak?
Unfortunately I didn't think of getting specifics of old pump; they simply said it was 1.5hp.
Well pump & irrigation are all inherited with buying the house. And nothing seems to be done particularly right. But this is good info if I work with an irrigation company to fix this stuff in the future.