Another one I've run into, make sure that the surface of your chair is level (left to right). There have been several cases where I've run into issues because e

Another one I've run into, make sure that the surface of your chair is level (left to right). There have been several cases where I've run into issues because either the chair seat itself was bent or a bushing at the bottom of the lift tube had failed introducing a few degrees of tilt. Barely enough to notice, but enough to throw your back out of line over the course of several hours.