Skating force at 45rpm

Not sure how that would affect the antiskating to much. I use very little antiskating on am SME V arm with the Benz LP-S. No problems using either speed on my setup.

Ciao,
Audioquest4life

Magnepan Unitrac I and Denon 103D(very low effective mass and high compliance). No problems here either, and I pay a great deal of attention to sound stage/imaging. It could be that your arm is more resistant to lateral displacement, than your cartridge's compliance, at the higher speed. Does your cantilever skew to the inside at all, at 45rpm?

Best way to test your theory is to play other 45's in your stash and see if they also like more AS. My bet is that this is one LP you have found that likes a bit more AS, and it just happens to be a 45.