I've read lots of places that chickens prefer the flat roost, and that it's better for cold climates, which we have. So this weekend we replace the 2" diameter branch we had with a 2x4, wide side up. But I'm wondering if the girls really like it. We have a monitor in the coop, and since we replaced it, I hear them moving all night long. Could they be uncomfortable? Should I put some sort of rough surface on the wood - it's pretty smooth.