Self adjusters keep overtighten

About the only way to tell how worn they are is to measure them with the special brake-drum measuring tool. I think the point hat 340Demon was making was more that the brake shoes need to be shaped to match the drums.
This does not seem to be done much any more, cuz most vehicles today have discs on the front, AND the rear brakes are only asked to do about 15% of the work. So if they take several thousands of miles to break in, most drivers will never notice.
However, I sortof agree that in your situation, machining the shoes to fit the drums could be beneficial to eliminating the self-adjuster issue.
I thought your country, at least the parts where you live, was relatively flat? Or maybe that was Finland. Anyway, where I live, the country is pretty flat, and I have not used an E-brake in decades,lol