you still haven't said what gun you got, but heres a little tip for ya.....
if its an HVLP, probably a GTI, you should be spraying at or around 10 psi AT THE CAP, that is 23 psi ON THE GAUGE, i usually use my gti at around 20 psi at the gauge
if its a PLUS gun, which i LOVE for clear and SS, you want the gauge at 30 psi sharp, i lay down all kinds of clear, from thinner chromaclear 7900s to super thick high solids low VOC's, sikkens autoclear hs+ like glass, the thicker the paint gets the closer to the panel you want to be(4" or so), just make sure to go fast as well, for thinner paints, i find its better to be a little further back(7" or so), and a little slower.
also i dont fuck around with over reducing shit, that will tend to increase die back, and most definately lessens gloss.
and i love devilbus guns, wont use anything else, and i especially dislike satas, they feel like shit, iwata's would be the gun i would use if it wasn't a devilbus.