[Patrick L.]

I think it's simple. Been working on this stuff for 60 years, born a dealership.
I'm one that uses a brake board. I also like 50/50. Mine will lock the brakes at 30-35 MPH.
But mechanical are a strange animal. They have to be right fron beginning to end. Starting with the adjuster, everything inside the drum [ I still use steel] , then the linkage arm angle and slack, then the rod adjustment.
I drive down a dirt/gravel road and give/take a click to a wheel if needed to get all stopping equally.
Once done correctly I find they'll run for years with just a quick click every once in awhile.