Alrighty, so I did a few things:
- Loosened the idler screw through the extruder fan. Had to loosen the fan mounting screws to get access as depicted, but wasn't a problem.
- Instead of tightening the extruder lever to maximum, I just went 1 below.
- I was printing at 197, now at 205 (PLA). Doubt this had a large effect, however.
- Changed retraction length from 1.5 to 1, Retraction speed to 30
I was also having a problem with the fan not turning on, melting the filament too far up the extractor and causing a clog. It was just some loose fan wiring on my part.