I have a brand new cable and brand new pads on my front drum brake. I just got it back from the shop today ( they put new rear tire tube on as well as did the front brake).
It has to be fully adjusted tight to get any kind of braking power and even then, it's iffy.
I put bike on my big Coca-Cola plastic crate/ bike stand and I can do the spin and listen thing and cant get them to go shhh-shhh-shhh sound. Does it sound like they mucked up ? or should I pop the drum off and check the inner drum surface?
I took off my brake cam arm (the arm that the brake cable goes to and is connected to the outer drum via a splined shaft) and rotated it a couple notches forward. Then I adjusted my cable. It has worked for me.