Hi,
What is the application that requires precision joysticks.
Have you programmed in a dead band for the zero position of your device.
Even in industrial and Xbox, PS3 and PS4 there is a deadband programmed, or a center position switch for each axis.
The output of your potentiometer joystick is only as good as your power supply, have you monitored your supply while testing you unit?
Thanks.. Tom.. 