One thing I find surprising is the way the cams are linked. If you use the outer cable on one and the inner on the other (as I did on my 8” tls conversion) you get twice the leverage compared with sharing the leverage as is the case by linking them.
You only have the force your finger & wrist can apply, regardless of how it is applied.
The leverage come from the difference in the arc your hand to the pivot and he cable nipple to the pivot.
Then the length of the brake arm.
If you could pull 100 lbs ( which you can't ) a single moving wire gives you 100 lbs at the cam which if things are good = 50 at each lever
The Comcal set up will also give you 50 at each lever.
What a properly set up comical does is give you better control and move the brake shoes a lot quicker
A quick application causes the floating shoes to bite into the drum and get maximum self servo effect.
Clowns with no understanding of physics and inability to read the instructions decided they needed longer levers which actually made the brake substantially worse.