Oof, that's a lot of roosters, especially if they're young - I currently have 2 roos to 17 hens, and I feel like I really should only have 1, or another half dozen hens.
Both my boys are young (6 months old) and the Brahma is super rough when mounting my girls, some of them are missing huge patches of feathers on their backs. I'm pretty sure he killed my little Silkie rooster too (RIP Dr Pecker

).
So yeah, that many roosters in one place sounds like trouble brewing... both in terms of killing each other, and over-mounting the hens. I've heard the minimum is 8 hens per rooster, but I would say that's pushing it. Hope this helps!