Quick couplers are very restrictive; I haven't had an issue with them while painting but if I am working on the wheel lugs on my 2 ton, I connect my 3/8" hose directly to my IR impact wrench and it make a HUGE difference in the torque. The spray gun issue sounds like the paint isn't strained and/or the air pressure dropping off.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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