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It sounds like that run should be big enough for the 6 of them. There is nothing wrong with adding more space, and there is a chance it might help-- but given how much they already have, I would not expect it to make a big difference, unless the space gets so big they can spread out and never...

How much space do they have now? Yes, more space might help. If they have a big open space, sometimes it helps to put something in the space so they can go around and behind and not see each other all the time. Example: https://www.backyardchickens.com/threads/a-cluttered-run.1323792/