That's exactly what it sounds like to me,,i.e., shot too dry.
Try reducing the air pressure to about half of what you were using. You don't say, but, if you did not reduce the color before spraying, chances are you required a much higher pressure to get the paint out of the gun.
My guess is you will probably need to reduce by 25-50% before spraying.
Good Luck,
Steve

Puckett Model Aviation