I'd personally be careful about bringing in another rooster. Depending in his age and maturity , there may be a pretty good fight with your current one. That may be more chasing and running than fighting or it may be a fight to the death. You just never know. My concern would be more from a biosecurity issue. You could quarantine and all that, but you are still taking chances and another whole month has gone by.
I agree to give him more time. Some are slower to mature than others. My last one was a lousy flock protector and he was fully mature. He kept all the hens fertile and would call them for food, but instead of placing himself in between the hens and danger, he would lead them to safety. Not the behavior I would expect from a flock protector. I've had 15 week old that did a much better job. They are all different.
Don't get hung up on ratios of roosters to hens or anything like that. The more roosters you have, the more likely you are to have problems, so I suggest keeping as few roosters as your goals allow. They are all different and you never know what will happen, but I'd think with your numbers and since they free range, the odds are really good that they will sort things out and make a pretty good group of flock protectors. It is interesting to see some of their behaviors when working together to protect the flock. For instance, when I have two, the dominant one is usually the first out the pop door in the morning while the other is the last one out. The first is checking things out. The other is protecting the rear.
What I would expect to happen with yours when they mature is that some roosters will carve out their own harem and sort of go their own way. I've also seen where roosters pair up and share their own harem. And with a flock that size, some hens will probably form their own group without a rooster and hang together. Either way, most eggs will wind up fertile.
Good luck. Sometimes those predators are hard to handle.
