Something you might want to check out...I had a weird sound coming from the front end and couldn't find it for the life of me. One day in the garage, I was moving the bike around and heard the noise again without loading the front end. Continued trying to replicate the noise and did so when I was grabbing the bars and moving it around. Turns out the left clip-on was a tad loose. Not to the point where it was moving around freely, but, just slightly. I tightened it up and the noise went away. Perhaps this is your issue, too? A somewhat loose clip-on might exaggerate some of the vibration??? Just a thought.