I’ve not had much luck with after market jockey wheels. I tried the BBB ceramics pictured, but they would have a tendency for riding over the chain on the lower jockey wheel requiring a back pedal to reset.
This might however of been due to the derailleur hanger being out of line, I don’t know. The stock jockeys seem to have a range of float, so they arnt really affected by hangar alignment in a great way.
But now, as my stock jockeys are considerably worn, it’s time to replace them. So I’m revisiting the alloy jockeys.
Only time will tell if a straight derailleur hangar solved the chain mesh issue.