I'm open to anything, whatever works the best. My only goal is to lower the trajectory, and I'd like to do it without having to add another zone. I'm not sure I can do it with Hunter MPs or PGJs, or RB 3500s.

You know what, looking at it again, the PGJs might be my best bet. They have the 1/2" inlet, so no upgrade there. And out of their nozzles the max size I'd need would have a trajectory of 15 degrees, or max height of 5'. 5' foot would be low enough for my trees.