You know I have not used that Accuspray for 5 years , I have forgotten what air pressure I was using shooting DBU & Global Clear , But those PSI's are a good starting point .

These Iwatas ( LVLP LPH 400 1.4 ) only use 16 PSi for color and 16-20 PSI for clear I have a Silver capped one for dedicated clear gun , the Orange cap Extreme for color and the Purple capped one for the hard pearls and metallics .
then I also have a W400 1.4 for sealers ,primer and clear .