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I've never been real impressed with Storey's guide to raising chickens but everyone else seems to think they are gospel. Birds roosts on branches...yes, even chickens. Branches are round, not flat. The problem, I'm sure, is not a bit about the OP's round roosts. Three generations of raising chickens on round roosts tells me so....of course, I've never written a book about it but I'm pretty darn sure most old chicken farmers haven't either.
I'd agree with you when it comes to bantams, or smaller breeds, but for the larger breeds, I have to disagree. Most birds havn't had humans tinkering with their DNA for thousands of years to make them bigger and better suited to humans like chickens have. Some breeds of chicken are so heavy that they can't walk, much less fly. Expecting a Cornish or a Jersey Giant to comfortably roost on a dowel-rod is going to get you chickens on the floor, fast!
In my mind, it's like having a little kid sit on a narrow bicycle seat and having no problem, then a heavy adult sitting on the same seat and getting a sore butt for a week after. My big-butt SLs get 2 2x4s laid flatwise and about 4 inches apart. That way if they need to sit on one they can; and if they need to sit between two, they can. I know my biggest chicken, Darla, LOVES to sit spanning the both of the boards. It irritates the other hens to no end
That being said, I think the OPs issue is coming from a combined problem of a round and thin roost, and really hot nights. Remember heat rises, and almost all types of earth have insulating properties. I know if I had to spend the night in that coop, I'd avoid the hot ceiling, and just lay in the cool sand. Ahhhhh