You need to switch to the deep bedding and compost pile model. Your chickens will derive a good portion of their daily nutrition from the worms and bugs that take up residence in the compost and mulch. Chickens were domesticated from jungle birds and really enjoy scratching through the leaf litter. Check out Geoff Lawtons and Justin Rhodes permaculture chicken videos great stuff!
Our barn is 14' x 22' half of which has no floor and subscribes to the deep litter method. You can see in this video https://steemit.com/gardening/@brimax/the-compost-connection that we benefit greatly from this concept. Thanks for sharing your ideas!