Try fermented feed and deep litter next time...and also maybe an electric poultry fence so that they can get out of the coop and spread that goodness all over the lawn so it won't be concentrated in one space?
Thanks for the tip, but maybe you missed the part where I said my chickens have access to 1/4 acre of yard 100% of the time. I have had no predator problems (other than the town's cat problem) so far. It just so happened that my feed store sold me CX that were really slow growers, that ended up in loving the heated floor of the coop when we got our first 4 feet of snow in October, and spent quite a bit of their time there until I butchered them in January.
I have used deep litter in the past, in my opinion, it does smell - not a bad smell to those of us who were raised on a farm/ranch - and if the neighbor walked next to the coop and breathed at the wrong time my god did I hear about it. In my most recent, and hopefully permanent coop, I chose to install a floor with radiant floor heating to combat our winter temperatures, which can be as low as -35. I made my choices for safety and cost effective reasons even if I have to do a little more work sweeping out the coop each week. I guess it boils down what you want to do, and what you feel is best for your birds.
The fermented feed process seems to elude me. I tried for weeks last summer, using every method and tip I read about, even ordering ACV online that had never been pasteurized... and all I ended up with in my attempts was grain ridden with maggots. I am sure I was doing something incorrectly, because so many have success, but it was terrible for me. The up-side, the chickens loved the maggots!