[EC900]

If the alignment is based on OEM specifications , does it make any difference that those are 930 TR, and maybe require a different spec from a standard 911 ? I don’t know spec.

I would try and find a source, member or local PCA with a hour or two to spare that has a set of 4 wheels/tires that you can swap out for a quick trial run and eliminate totally the tire issue.

Here’s a costly and labor intensive experiment: Swapping the corners or rotating the tires is not the same as reversing the mounting; same wheel, same tire, just reverse the sidewalls form inner to outer.