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when the clutch is above the threshold where it sticks how does manually moving the cage feel? does it seem like it is sticking? and when you serviced it what did you do?
only other thing i can think of is that the motor is supplying less force than it should.
also maybe this was mentioned before but i assume b-tension is appropriate? i'd probably have messed with that a bit too.
Sorry, I worded it wrong. I tried a longer chain (116 links) but there was no difference.