Rear brakes sticking or dragging when moving slow

[Asshat]

Not sure why, but every now and then, my brakes stick when going slow.

The rear end is out of an 83-ish truck, 3/4 ton, 8 lug.
If the brake adjuster is all the way in, it’s really free spinning. To get the shoes just touching the drums, the adjuster is half-way out.

And, I have these marks on the shoes like it’s skipping or bouncing.

The front has discs. I plan on eventually converting to disc on the rear.