As you said, you're more than happy with Janns so stick with what works for you for sure.. But Testors has a good selection of Pearl enamels plus a clear pearl that can pearlize any color you spray it over.. I usually coat my entire lure with it prior to epoxy coating.. You can spray enamel over dry lacquer..Testors Pactra Racing Finish Pearl White Clear is what the label says.. I spray alot of lacquers too, Spaz Stik paints.. You might check his site & see if he stocks Pearls.. Spaz Stik is airbrush ready as they're much thinner than enamel & waterbase paints right from the get go..But I've never tried Janns stuff, it might be for jig painting possibly?.. I've never had to thin any lacquers that I've purchased as of yet.. Like Spoopa said, turn up the PSI, should help out quite a bit..Or try adding a few drops of lacquer thinner..
John