Once the bracket with the holes began to wear out, I found that I was always replacing the spring tab with the little nub on it.
The nub would wear fast and that was why they were jumping up and down.
I too need to give them a good kick to move them. I had to tighten them real tight to get them to stay put.
My experience has led me to the conclusion that I either need to live with the hard adjustment, or replace whole quadrants ($$$$)