Terrible under-extrusion with TPU

Stock V Minion: bondtech lgx lite, dragonfly BMO. I can't even extrude more than 50mm before it either clogs or just slows down to a halt, but then if I request another extrusion, it'll squirt out a little bit more. It's not a smooth extrusion, it speeds up and slows down. I'm extruding at 3 mm/s at 240C. I've also put the extruder tension in the flexible setting.
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