That sounds awesome! Glad to hear they're all doing great. I was just trying to offer a suggestion that might help them adjust to roosting again.
Because you didn't originally state the dimensions and yes, a picture can be deceiving. That, along with always hearing about so many folks (sooo...
I think it looks a bit tight for 10 birds too. Are they all bantams except for one?
They're only 8 months old so they're still getting bigger, at least bigger than they used to be in the old coop. Generally, each bird needs 12 linear inches on a roost, so hopefully your roosts are about 5'...