Zoo,
When I got my five Leghorns, I began to think they were all roosters when their big red combs started developing, and they started showing territorial behaviors, and there were size differences among the five, so I can feel your pain. I raised them from chicks, but I am in town where roosters would disturb my neighbors and not produce any eggs. Luckily, they were all hens, but I'm not sure what I would have done if I ended up with a rooster or two. Maybe you could run an ad on Craigslist, Freecycles or Give Aways in the paper in your area with the condition he will be a pet only. There are people who breed chickens or simply want a rooster to watch over their flock. But it sounds like he is making progress with your girls, so maybe it will work out, and do try a different wire. If your chickens can poke their heads through the wire, that means other critters can too- skunks, raccoon, cats/dogs, etc. And I'm sure things will improve when their space is bigger. Good luck.