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Oops. I had replaced the tension arm, spring, and hob gear before calibrating. Turns out I attached the gear too low, so it wasn't pushing the filament through. Adjusted the gear, and calibration tests became consistent. Printing nicely now.


I just saw your update so I'm adding a new answer to address it specifically. Your print looks much better, and all the remaining problems are likely caused by Cura's bad default Limit Support Retractions option. It causes Cura to skip retracting when moving from one support structure to another, producing heavy oozing/stringing there and leaving ...

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