Welcome to the BYC forums
What do you love about the Free Range method? It appears you already lost 3 chickens to predation. Where I live, we have heavy predation from eagles and hawks. So from the beginning I have kept my chickens in a chicken run with a bird netting cover. People around here that try to free range their chickens are soon called former chicken owners.
I have 3 acres on a lake, and if not for predator concerns, I would like to have my girls running around the property eating everything they could find. But, since I can't free range my birds without expected losses, I have to settle for cutting and bagging grass clippings and feeding them to the chickens in the chicken run. it is my attempt to bring the range to them in their not-so-free, but protected, chicken run.