Sorry if I didn’t read every post and this was discussed:
I believe in fin set up but run into too many variables (proper skiing technique mostly) to apply reliable assessments (to myself or anyone else).
However, I recently switched to a heavier gauge string on my guitar. After trying to ignore the extra tension, higher action, and onset of carpal tunnel syndrome I switched back and it was like butter.
The difference on the string with the largest variance was .006 of an inch!
Off topic me if needed, I was just happy to be talking thousandths of inches about something other than skiing. Rare.