I simply used the setup and calibration functions within the Eye Tracking software. I originally found that the edge tracking was slightly degraded due to the not being mounted correctly. Hence making my own version to compensate for the screen curvature and ensure the correct angle to track my eyes. I have the Predator X35 and play Arma3, Il2, Elite, Dying Light etc with no issues.
How have you mounted the 4c?
What games are you playing (can you adjust the tracking settings within)
Firmware, etc up to date?