Looks like I spoke too soon.
Went up the back to try and tweak the meshing, seemed to be getting close, then it bound up. Backed it off, still bound. Backed it off some more, same result, then even more, where the axis had very noticeable slop, and now the worm isn't moving, even though I can hear the motor going and it's not binding. I think the belt must have come off the worm/motor, so maybe it was never backlash to begin with, maybe I didn't tension the belt(s) properly.
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