Soffetts bring in air, but that air needs to exhaust somewhere, either through gable vents or roof vents.
Are the windows a good foot above roosting height? If not, they are causing drafts, not providing ventilation.
Usually red earlobes indicates brown layers. The half beak looks like it was clipped as a chick. It's a common practice in commercial poultry farms to clip beaks. They keep the birds in such close quarters that it's the only way to prevent the birds from pecking each other to death from the...
Looks like a Partridge Rock, but with dark legs instead of yellow. Probably a mixed breed.
It can take months for the pecking order fights to stop. Just popping 4 new hens into an established flock is going to cause a lot of stress on everybody.
A look-but-don't-touch period of a few weeks...