I am probably the last lifeform in the known universe to have discovered it, but if it bothers you that a Head-Up Display is not collimated (stabilized), a partial solution is to make a separate profile for your TrackIR with the X, Y and Z axis disabled. In most planes the forward view is enough for not badly needing the lateral movements of these axes, and the HUD symbology will remain much more stable (although not completely so; if you pull up the nose for example, the horizon line will often move slightly).
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