If I was going to be away I would have them in a secure place and safe. Maybe you should try something other than what you're currently feeding them. I feed my birds All Flock or Flock Raiser. I also give them oyster shells and grit. The feed is higher in protein but I also breed and hatch and like the higher protein. I'm in Florida too near Ocala. I have electric wires around my coops and pens, good heavy duty netting covering the pens to protect the birds from aerial predators and concrete under the gates for diggers. I do leave the pop doors open in the coops so the birds can go in and out of their coops at their will. So far nothing has gotten past the electric wires. Good luck...
http://www.poultrydvm.com/featured-infographic/tips-for-protecting-poultry-from-predators
http://www.poultrydvm.com/featured-infographic/tips-for-protecting-poultry-from-predators