In that same time frame a hawk came down and attacked Butters again, who squirmed away, and as it hopped over to get her against the fence I ran towards them and all the hawk did at first was flap-jump up onto a chair back. It was so hungry it really had to decide before flying away. I appreciate their lives and what they have to do, and they are very cool, but not in my back yard.
I like the looks of your chicken areas and yard. The terracing does dictate how you can arrange it but it looks nice and big enough. Raccoons - you need at least very good wood framing or welded wire and hardware cloth. I think
@rosemarythyme and others have basically chain-link fencing around their complex. Raccoons have nothing but time to figure out where your weaknesses are. And they are strong. On Facebook I know of someone who put hardware cloth all the way up the side of their run, not just three feet, because they lost chickens who were roosting up high but near the wall.
If you can run electric fencing around just your chicken terrace that will help, because it is a deterrent to further investigations.