I came across some misters that I'm using in my outdoor soil/container garden which use 10 gph (38 lph?) each, and they have nice varieties of patterns available. At 50 psi regulated hose pressure with a 10 gph restrictor their green full-circle spinners will spray about a 7 foot circle, so way lower pressure and/or flow shouldn't be an issue I'm guessing. They have some other non-spinning fan nozzles that also do well on low pressure/low flow.
Made by
MisterLandscaper and they are sold in the US at Lowes stores. I don't know if that helps anyone, but I am going to try them when I build a small
aeroponic system.
My outdoor soil green & red sweet peppers are slow growing as well & I have just transplanted them into an outdoor ebb & flow to see if they speed up any. My other soil plants (tomato, cucumber, yellow squash and a banana pepper) have already started producing.