Very sooty rubber on those grommets.
When I slid the rubber grommets up to adjust my mirrors, the grommets left black smears on my fingers. I concluded the rubber was a poor grade, so I ripped them off and discarded them. The plated nuts look better than the grommets did, so I don't miss them.
Your grommets may be better quality, but if you wonder why your hands get black when you monkey with the mirrors, they may be as bad as mine were.
The tension on my mirror locknuts is just right. The mirrors stay where I want them, but if my load or manner of riding changes, I can adjust the mirrors by tugging on them. I think the mechanism is well designed.
V-Tom, please tell me again about the improved mirrors you are running. In a few weeks, I will be carrying a load two feet wide, and the stock mirrors JUST permit me to see squarely behind the enormous trunk on the back. If your mirrors stick out farther than stock, maybe I should get a pair.
I look forward to riding with you again!