SIK1, it's pretty normal for the TrackIR to appear overly sensitive when you first start using it. I recommend you try using the basic flight profile provided with TIR and practice off-line or in the TA until you become comfortable. It's relatively "slow" and smooth so is pretty easy to use although it becomes too slow for combat and you'll want to pick up the gains eventually to help you keep track during quick maneuvers. Over a period of a few months I've increased the gains to where I'm up to values as high as 80 where the basic flight profile gets no higher than 15. Also, even when using the provided profiles I recommend you disable the roll axis. It really doesn't help and introduces movements that can make TIR more confusing to use in a dynamic enviornment.
You can also try bump up the "smoothing" function to about 80 but you want to be careful that you don't introduce a lot of lag in the response. Too much lag and what you'll see is you'll move your head and since you don't see an immediate response you move your head further. The view will lag behind these moves and when they catch up it'll overshoot and look jumpy.
I've never heard that the profiles are specific to TIR3 or TIR4, that may be true but I don't see why. I have a couple of profiles for the TIR4 that I'll share with you if you want, just send me a PM.
Also, I agree with Balsy about setting a key for the forward view, it'll help a lot with gunnery. A few weeks ago I almost completely eliminated the dead bands for the pitch and yaw axis and use this forward view key to keep my view aligned properly in the windscreen. To me, the deadbands give a "rubber band" type feeling where the views tend to be pulled toward the pitch and yaw axis. This is unnatural to me and I'm really likeing my new profile.
