With the recent Tobii Eye Tracker 5 firmware update (thanks u/CaptainSnackbar - link in comments), I think I've gotten my setup nice and stable with help from u/funnybuttnoises. Feel free to try
Tobii Gaming Download or Setup Eye Tracking Software and Drivers
How to predict choice using eye-movements data? - ScienceDirect
Tobii PCEye 5 - Inclusive Technology
Tobii Eye Tracker - General X-Plane Discussion - X-Plane.Org Forum
Tobii Eye Tracker - General X-Plane Discussion - X-Plane.Org Forum
Review: My Experience With TrackIR and Tobii - Threshold
Alienware 17 R4 Tobii Eye tracking not connected
Eyes-on with Tobii's eye-tracking technology