Yep, I've got a CH and it is all over the place. Most likely because of the terrible design in the base which causes a rough tension line in the center of the X axis when moving the Y axis. I've found the best way to shoot down planes. Instead of getting directly on their six where most of you are having a hard time aiming and getting hits off. Hold your fire until they pull away, when they do, jerk hard on the stick to get a nice lead and fire quick short bursts. - It usually takes a wing or two off. Works in the p51 atleast.
Because of the improved gunnery, fire at your target when he shows the most surfaces visible to you - in the beginning/middle of a bank.