Consistancy will be effected by several factors including:
~ a bad paint to barrel match
~mix matching paint (I call this skittles) where you load 50 of these and 20 of those and 40 of another into your hopper.
~ Bad air flow from the tank. Some of the Nitro Duck tanks have a long pin. When you screw in the tank, you will hear and feel the pin open as air enters the gun. From there you should turn the tank another 1/4 turn, but no more. Anything more than that and you will start to have the pin in the ASA plug the hole in the tank.
~ paint in your ball detent.
~ o-ring problem in the max-flow or you need to clean the max-flow.
Hope some of this helps