Thanks for tips on braids. I used a toothbrush with lighter fluid the last few weeks and picked up a tenth on my 4.5sec track - every time I use this tip.
As I checked out a car, I noticed and marked the location of a "catch" between a certain tooth of the pinion and inline gear. With a fine hobby file, I lightly brushed between the gear teeth. The catch went away and the car went from middle 25 to top ten of my fleet. It runs much more quietly and with less vibration, holds corners like the shoe goo :D . You guys have probably talked about this type of fix on the site but It was nice experiment that worked instead of replacement.