Thanks. I will revisit the current troublesome brake with these tips, and see what happens.

What I've been doing is adjusting the brakes so tight to the rim (minimal pad gap) that neither arm moves very much. This requires fussy truing but appeases my OCD. The bike I'm working on today is my son's high school bike, it leads a rather hard life and running such tight pad gaps isn't practical. The front rim takes a beating as he often lets the tire go too soft. It is a 36H MA40 rim, Mavic 410 (Modolo Speedy) calipers.