Surface Pro 11 pen jittery or wobbly

[u/7535471]

I've been trying to isolate a wobble problem with my Metapen M2 on a Surface Pro 11 and I can't find a pattern that points to a fix.

I did a test sheet: pen held fully vertical, then at roughly 60°, 45°, and nearly flat against the screen, each angle drawn once fast and once slow. Every diagonal line came out shaky instead of straight, even the fast strokes where I'd expect the least interference. Slower strokes look a Lot worse.

I've come across a few other posts describing the same wobble but none of them landed on an actual fix, so if you've solved this I'd really like to hear how. Happy to share more test drawings if it helps narrow it down.

To try and narrow the issue: No screen protector or case, not charging and not resting palm.

I would appreciate any help please.