Spray clear paint with Sata Jet 3000

Hi guys, I’m new to the forum, I signed up here because I didn’t find anything about it on the net and I don’t know any more about it myself. Vlt someone has an idea. So I always painted with a can and could gain experience. Now I got a Sata Jet 3000 Digital HVLP, today I wanted to test the part because an old Ford as a practice object, base varnish was no problem, when I sprayed the clear varnish the suffering went off, on the side part saw everything still wonderful from the clear varnish is well run into each other I had a plane surface, then already directly from the door it started that the clear varnish did not cover properly anymore but looked rather rough and like not so strong any more. Nozzle 1.2, gun set on 2 bar. As said side part was good and the rest directly worse. Have a compressor with 500L boiler with about 10 bar pressure. One thing I noticed, had set the gun on 2 bar and and when I painted after could that be the mistake? But do 0.15 bar have such a big impact? Thanks already