Small update to this: My local service center escalated this to a regional technician who did some remote diagnosis. They weren't able to find any faults, but they did escalate this to Tesla engineering. I received a response back this morning that Tesla engineering looked into it and is not aware of any recent steering changes. However an internal case has been opened, and additional information can be added to this case if others start to notice the issue and it becomes a trend.
All of my communications with the regional tech were via phone and they were very professional. They also definitely seemed to know what they were talking about, a very pleasant change from the staff at my service center.
The mystery continues...