It's a possibility Opa, but they were like this even without a rooster for a while too. I will have to do some observing and see the temperament differences. Thanks.
I had a similar situation in my flock. I watch and watched. It turned out that while perching at night they would peck/pick on about 5 of my hens. It was only these 5, and not the others. They would simply pull the feathers off the backs, and leave the hen bare back... After reading what to do, I read you can cover it while it heals, or put something undesirable tasting on the pecked hen's back. If I remember right it was vapor rub?