Please let me know the quail groups you frequent on Facebook. it sounds like you are located in an areas that gets a lot of sun and wind as well. So no matter how well the hatchery packages the eggs there is typically a lot of loss? Is there a hatchery that you like best?
I'd love to see pictures of your setup. It would help me a lot. I have to be cautious about southern exposure too. There is one room in our house that faces the south and it is 10 degrees hotter than the other rooms as are the western facing rooms that don't have a patio in front of them.
It sounds like the odor they produce can't be too bad if you have yours against your house. I've heard the brooder aroma can be really bad.
Glad to learn that they can't really peck at the plastic or shade cloth. I'd hate to have to continually replace because of holes they make. :)