I never have used it but have adjusted that gun over the phone for a number of people.
The gun works good with a 1.4 but will not spray the clear right with a 1.3.
Make sure there is no internal strainer in gun.
Fan wide open and then turn in 10% (check pattern after all adjustments are made to make sure you are not blowing out the center.
Fluid adjustment turn in and then out 3 turns.
Air at gun is going to work from 24 to 30 LBs so a good starting point is 26 lbs (with trigger pulled.
Make sure scfm or air at wall is 125 lbs or higher.
Hold gun 6" from panel.