Chickens don't use smell to identify, so they aren't getting used to his scent. They can barely smell.
It's another reason that happens to be coinciding, there's no reason that the very presence of a male speeds up the hormone cycle. It ovulation, only hormones (controlled by light and...
They do need more ventilation than that, that's not enough unfortunately. You need at least 1 squarefoot not sure how a vent in the floor would help cooling. It's not all about cooling, they also need ventilation from ammonia fumes.
They do need natural light, adequate ventilation will likely...