I might try to find a good fitter. I have had three fits in my life and none of them seemed interested in how I sat on the saddle but I was perfectly square and even.
I have a new theory thinking about it. I used to clip in on the left but now I learned to clip in from the right foot because it hurt too much clipping in from the left (broken left ribs, scapula, clavicle, humerus, and rebuilt elbow, etc). MAYBE.......I inadvertently learned to shift to the right just by how I get on the the bike. Sounds far fetched. There is a Retul fitter about an hour away. ERO sports in Allentown, PA. I know nothing about them but the 3D of Retul sounds like what might help diagnose.
I was hoping someone would have the solution by inspection: N + 1