I think most people install TrackIR and want to to be instantly just as successful as they were before using TrackIR - that's just simply not the case. TrackIR will make things better for you, but you have to understand that there's a relearning period where you'll temporarily get worse. This is normal, and if you stick with it, you'll learn it and come out even better than before... but you have to stick with it. Doing things such as turning off axes, etc. only prolongs the learning period.
Just my .02
(Again, yes, I have all axes turned on)