Rich as in 4 stroking rich? Give it another couple of tanks set at the point where it's breaking between 4 and 2 stroking but pinch the fuel line for a moment to lean it into a full 2 stroke then back to the rich setting for maybe 30 seconds then pinch again. Then go fly but set the needle so it's only just into a clean 2 stroke because it still needs more rich running in. Even when run in I like to have at least a 500-1000 rev drop from peaked.