Chickassan
RIP 1975-2022
Ok, firstly your new introductions will not be on totally accepted into the flock until they are mature which is nearly at the point of lay. Until then they're going to get harassed give them places to hide or places to get up away from the others also give a couple more food and water stations. Your little roo will eventually be accepted once the hens are mature and have decided he's good enough lol! It's really quite complex for a roo! He should simmer down after the hens give him the thumbs up.

We currently have 9 hens and 2 roosters. We had started out with more but I totally suck at buying sexed chicks and seem to come out top heavy with roosters. We gave several away but had wanted to keep my 2 favorite boys. So I went and got more sexed chicks after the discovery of so many roosters many weeks later. Of our newer additions, we have more roosters to deal with but got 6 more hens out of them. If we can ever successfully integrate the new chickens (they are currently in their own section of the run at 13 weeks old) we will have 15 hens. Successful integration feels like forever from now. We tried letting them mingle for about an hour (they are maybe just an inch shorter than the established flock) but the poor things got bullied into a corner.
I wish we had 25+ chickens but the DH won't let me. Starting this chicken stuff was all his idea and he insisted on it. Even dragged me to the store and showed me those tiny balls of fluff. I was the one that got stuck taking care of them and I wouldn't change it for the world. Just wish my head rooster wasn't such a cock! Maybe putting him by himself is our only option if he doesn't calm down. I have watched him do his little mating dance but the hens keep rejecting him. Could he just be pent up with hormones and if a hen finally accepts him, could he simmer down?