Glad you joined us! You got some good advice here already, all I can add is make sure they eat well (good quality layer feed) and give them time. It's possible that a combination of stress from the move and the shorter days are to blame, but I am a little concerned that the previous owner said they were not laying well for him either? They may be in their 2nd or 3rd year of laying then. It wouldn't hurt to do some precautionary pest control as well. Deworm them and dust them and the coop for mites/lice.
Glad your Barred Rocks started laying, they are great layers. Sometimes they get bored and pull out other chickens feathers. The Roosters usually are so good with the hens they allow it. Hope it stops soon.
Alright I got a question. My chickens I've noticed in the past week have been a lot more food than normal. Is there anything I can put in there to help fill them up or are they just that hungry?