I've had my Harder and Steenbeck Evolution for about a year now, and have been using it on and off. Until recently, I've noticed that the air pressure coming out of the feed isn't right for what is coming out of the air compressor. I know this because I've ran air through my airbrush without the nozzle on and the air coming out correlates with the psi on the compressor gauge. I'm really not sure on what to do. Could any one offer any expertise, and I'm a bit of a noob when it comes down to airbrushes.