Previously, and even with the recent 1.5.1 update with firmware 86a, I noticed that calibrating the controller with the restrictor ring causes the thumbstick to be jittery and can even get stuck in an off centered position similar to stick drift while I'm using it. Not sure if anyone else is experiencing this, but the fix I found is to calibrate the controller without the restrictor ring and the thumbstick goes back to being dead on center and no jitter. Maybe calibration with the restrictor ring results in oversensitivity of the thumbstick, ¯\_(ツ)_/¯