Mine has a little clunk too. Took it apart and could not find any problem. Had the dealer look at it and they could not help with any advice. They checked the neck and all good. I have learned to live with it and after about 17,000 miles have not gotten any worse. No wobble, drives great. I also called Progressive a couple of years ago and they were no help. I have installed the monotubes on two friends bikes and they don't clunk. Sorry, don't have a cause or cure.
"Don't Cheat yourself, Treat yourself"
2015 Superior Blue RG Special