Hi @streetrobban, sorry to hear about your troubles. A couple of suggestions for trying to improve accuracy. you mentioned already lighting, but perhaps you could try eliminating and possible sources of Infrared light such as windows or strong spotlights from your environment?
Also, just in case you have any facial piercings, try removing them to see if the reflectivity from these is interfering.. also, do you have another user to test with to see if the accuracy issue is specific to you or generic?
Please also ensure the Tobii Tracker 4C is running the latest firwmare as determined from the Tobii Interaction Software on the system tray and get back to me.
I am afraid there is not the option for a manually configuration of screen calibration locations.