Did you losen the idler tension screws? TPE requires that the tension is very very light otherwise it tends to buckle around the gear before entering the nozzle tube. Reducing retractions to a minimum is also always a good idea, as well as limiting the max flow rate.

A handful? Wow that’s gotta be like 50% of the 50 series out there!

I prefer main simply because it faster to type. I propose main branches be renamed to “m”

It’s like vim but with lsp support out of the box and the keybindings make sense

I’m afraid I can’t recommend anything as I’ve never had issues with this, so I never really researched it. But if the banding frequency changes from print to print, then an issue with the Z axis is unlikely

What is driving the bed height? Lead screws? Check if they are straight and/or wobble around as they turn. Any imprecision in bed height due to mechanical issues with the Z axis would also translate into perimeter width variations.

I can only guess the print orientation but it looks like curling to me. Basically on that side, the part cooling fan (or lack thereof) is making the plastic of overhangs curl more than on the opposite side which gives you this bad surface finish. Otherwise maybe a retraction issue but that would probably show in other places too (oozing).