It depends on your airbrushes needle size, and the paint you're shooting.
I use a .3mm nozzle, and I thin my paint to the consistency of skim milk. I am able to shoot with 15psi up to 40psi without problems. Lower than that, and my paint can be spotty, requiring constant triggering. Higher than that, and I blow the paint off the lure blank.
I would make sure my paint is thinned, and then do some test spraying on a piece of white paper, to see what works for your particular airbrush.