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Got it - so the problem is in retracting a little and staying there so the filament cools inside the hot end, vs. unloading completely.

Bought a pair of Micro-Swiss hot ends, and they're FANTASTIC. I'm getting the best prints ever from my FlashForge, using a wide range of materials (Nylon, ABS, PLA). Even (kinda) NinjaFlex, though that's tricky.