Greg. I would suggest the opposite. Lots of paint flow, pull the trigger back a lot. Keep psi around 18-25?? Giver her lots of paint, just before it starts to run all over heck. This means keeping the airbrush further away from the suface so you don't get splatters and runs. You want a wide pattern with lots of overlap on each pass. Now remember Aqua gloss is pre-thinned(the paint industry rule is adding more thinner can affect the gloss) so you can't control the end sheen. I don't think its the shiniest gloss out there but it works fine.
And for washes on a black surface, aka a spinner, I go with a grayish/brown wash so its visible agains the black.
Do keep me posted as you spray more petroleum based Kleer coat over acrys, please. I'm bound to try it sooner or later.