Be sure to file a bug report so that it can be fixed. Also post your problem in this thread(and vote for it too): Tobii Eye Tracking needs configuration options.
In the mean time you can make sensitivity adjustments by using FaceTrackNoIR V200, I posted a guide here: https://forums.flightsimulator.com/t/making-tobii-eye-tracker-work-with-su8/472111/252.