Sorry for your loss of birds
@thomasj .
Agree with much of what is said above. Secure coop, don’t feed the coon, remove ones from under your shed, and coons are opportunistic. I’ll add they are murderous Little devils.
you could just decide to free range, and plan for losses accordingly.. have a timetable to raise new replacement chicks, but you will need a secure coop for that to work. There are some that let their birds roost in trees at night too. But there will be losses and generally the best luck there is with game hens, or similar type of agile/outdoor smart chicken....not your typical heritage type dual purpose. So, you can live in a sort of natural harmony, but it will take different planning than what you are doing now.
if you decide that you would rather have your chickens secure and safe from the predators, And their meat and eggs available for you (instead of the predators), then you plan more along the lines of what has been mentioned earlier.
FWIW, I’m in active-coon-hunt mode. My neighbor had his entire flock wiped out in 2 nights by coons. We (myself, and 2 neighbors) have trapped and killed 8 of the murderous little devils. They killed more than 8 chickens...ripped them apart while alive, so the coons had a more humane death than the chickens did. The coons are now interested in my flock ...

so, the hunt continues. My neighbor kept his feed outside in a weather proof container, but coon could access it if they wanted, and it appears that onoccasion they did. They also raided several gardens nearby, and maybe pet food if anyone has left any out. So, they had food access but killed the chickens anyway.