Originally Posted by
miamijim
Its vey relevant. If the cable is too tight the RD wont rest firmly against the stop.
The OP's issues are classic symptoms of worn out jockey wheels, a tight cable or too short of a chain.
The chain is the longest it can be and the cable allows the RD to rest on the stop. I'll look into the jockey wheel situation. They aren't sloppy on their bearings and have minimal side to side play but maybe the cog profile is too worn down. I don't have any new ones to compare them to.