The more you describe the noise, and when it occurs, has me fairly convinced the issue is end gap on the rocker assembly. If you don’t want to tackle it yourself you could have Imperial Motorcycles do it for you. They did my R1100S and it was silent afterward. He’ll have to readjust your valves after. They’re also a sponsor of our club. Give them a call, talk to Andii or Stefano and tell them you were talking to me. 604-433-5004.