Weinmann 500's were the unsung heros of a budget racer decades ago, and they could be hot rodded for improved performance, flatten the pivot faces with a stone and or end mill and all they lacked was a watch like quick release feature.

An important aspect that cannot be isolated today, it that OLD pads behave differently, and do not forget when in the wet.

Long ago there was an article in Bicycling! Mag about brake performance where the mechanical dimensions were used to predict performance, it was pretty easy to see that short reach calipers would always produce better numbers than "normal" reach.

I put all vintage sidepull calipers in about same category, it was the performance of "modern" precision dual pivots, the old CLB was the right idea, just poorly executed.

Don't forget Gran Compe centerpulls with the ball bearing pivots, if campagnolo had made a traditional center pull that would have been it.