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While I did take it apart it was a time-limited clean, so I’m sure I could do a more thorough job. The (Hope) jockey wheels are relatively new compared to the derailleur, and were spinning very nicely when I played with them. Didn’t take them apart to clean more because they rolled well. Guess it wouldn’t hurt to take a look though. Thanks.
Did you disassemble the derailleur when you cleaned? Sounds like maybe the pulley wheels are sticking.
Edit - doesn’t really explain why it only happens under load 🤨