Welcome to BYC Kim! There is many great people in here who are always willing to help. Thanks for sharing your story and for providing those chicks and bunnies a home. I appreciate the pics and just so you know, we LOVE pics in this forum!
Yes! Posting your location would help tremendously. There may be some local breeders near you that could most likely help you out. I've been searching locally and it seems that everyday I find out about more and more people than I ever expected to find.
Welcome to BYC! First things that come to my mind are differences in feed and potentially in water as well. From there you need to see what else are you doing differently. More room to move around, exposure to sun and climate conditions as well?
Several good points have been brought up so I won't repeat those. One other item to factor in after completing the other recommendations would be to possibly get a rooster so that he can step in and diffuse any potential problems amongst the hens.
Good thing you have two roosters left! Seems like they're of good temperament and should remain that way. My current flock of "teens" appears to possibly have 5 or 6 roosters out of a flock of 10! They all seem to get along well with 1 particular rooster appearing to be the Alpha but with great...