iFixit has attributed DualSense drift to multiple hardware shortcomings with Sony's latest controller, ruling out software as a culprit. Apparently, little can be done to rectify the problem, short of Sony redesigning the DualSense.
https://www.notebookcheck.net/PS5-DualSense-drift-problems-attributed-to-multiple-hardware-shortcomings-software-issues-ruled-out.522887.0.html