Like I said, every cage has it's own dynamic structure.
Yeah, at times, a couple of my cages can look like a horror film full of mice.
Males are generally just one per cage, but at times, a baby may get left in and grow up. Most of the time, the skirmishes are with newly introduced females.

As for a rotating rack, I'd still just run a small colony in each bin, and be done with it. Pull the weaners out on a regular basis, and they should be fine.