Was this ever solved?
I'm a Track IR user too, have been for almost a year. Last night, my views in TIR started doing what the OP was talking about - when I turned my head, it behaved like I was using the hat switch and would not track with my slow movement but then snap about 45 degrees. I didn't play around with it much - fixed it by restarting both the game and Track IR. I had been flying a group of bombers, had been jumping from position to position and plane to plane, and IIRC all three planes were shot out from under me. Dunno how that would make a difference but its really rare that I fly buffs.