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In a way I guess your older roo is coming to the hen's rescue, but what he's actually doing is preventing the younger roos (his subordinates) from mating. As the alpha roo, that's his job. Nature has programmed it into his brain to always be the one to father offspring. If you'll notice, alot of times after the alpha chases a subordinate off a hen the alpha will turn right around and mate that same hen as soon as he's done chasing the sub.
I agree, too many roosters for 13 hens. They'll overmate the hens or at least try and that'll stress the hens out.
You might be able to get away with two roos, especially if the younger one continues to be submissive to the older, alpha roo.