I don’t know about this. Think it better to have all heads pressure regulated. Maybe the issue here is undersized pipe and an issue of pure flow. He can take an inventory of the nozzles then look them up in the manufactures catalog. He can check the size of the pipe and look up pipe friction loss charts. Regarding flow, just had a situation where a site had 26 Rain Bird 8Van nozzles at 1.19 gpm each. Suggested swapping nozzle and the flow dropped to .20 gpm. Made all the difference in the world.
