No pecking problems here at all. They really only go in the coop to sleep and use the nesting boxes. Only about 8 sq ft of my dang coop gets used. So frustrating!They may fit in a smaller coop, but you would have pecking problems. It's not what we think is enough space, it's what the chickens need.
BUT I would never ever go that small. Just wish I'd not built such a monster of a coop.
I would never regret a coop that's too big.
Better to start off with that instead of ending up with a condo complex of coops.