I'm not in my shop right now but I want to say 2040 "steps per" rings a bell in my motor config. My units are set to inches.

Yes, good idea. I can try bumping it along one step at a time. Might be slow going, but eventually my indicator will show something (assuming it is not a strange problem that only occurs with ESS is driving both X and Y simultaneously).

As you say, maybe that will allow me to isolate to X vs Y. Or maybe I will see it on both....

I will give it a shot.