Ok, that’s an odd one Brad! Good photos and description by the way.
If what you say is true:
printing from left to right lays down a nice layer
printing from right to left leaves a torn layer
Then, have done 2 things:
- polished the tip of the nozzle. It could be that there is a bur on one side that is snagging when going one direction
- tried rotating the part 90° to print along the other axis (btw was this aligned with X or Y axis?).
You could also try rotating the infill 45° to see what happens then.
It really looks like a nozzle/orifice issue more than over or under extruding.