I thought the Freedom Rangers were meat birds? There's a brown Leghorn that might be able to hide better than the white ones. Red stars and Rhode Island Reds are supposed to be great producers. AFAIK, Leghorns have the best feed to egg conversion though. I agree, with higher production birds you'll need to feed them. Wild chickens did not lay as often and did not need as much nutrition. Most birds you buy today have been bred for production which requires more nutrition. I think getting larger birds won't decrease the odds of a predator attack. It may even worsen the odds since the larger breeds won't be as agile or able to fly away from problems. You'll certainly need a good coop. Seems most people lose birds to predators at night.