Here is a short video I made of me with a profile I've been working on in TrackIR 5, with ProClip using Mouse Emulation and mouse look in GPBikes. It's not prefect I'm still working on things main thing is that the mouse cursor and the target in TrackIR are running at slightly different speeds so eventually they are off from each other. If I can figure out how to keep them running together it should work a lot better, this profile I set the field that TrackIR target for head movement to be very limited. Since you can only move so far in GP Bikes, it feels a little floating. I'm using fall manual controls and full manual leans.
TrackIR Mouse Look Testing
https://www.youtube.com/v/ebLITxHQTn8
Are you using TrackIr drivers or Freetrack V2.2?
TrackIR Drivers, I tried FreeTrack but it wants a webcam and this computer I'm on doesn't have one if I hit Start in FreeTrack it crashes instantly.