The copper piping, air dryer, and QC3 are all new. I added it all after I started having problems. It used to be just all rubber hoses and a couple of regulator/filters, which was problem free for 3 years.
I believe the air dryer is working, the inlet is luke warm and outlet is cold.
I didn't change my spraying technique from when it was working to when I started having problems, but to try to solve it, I've sprayed at higher pressure, lower pressure, farther, closer, light coats, wet coats, reduced, not reduced, retarded, not retarded and any combination I could think of, still can't get rid of it.
Tried another compressor also, still no luck. And my main compressor and the smaller one I tried are both the oil-less type.