In my opinion - it's cruel to release a 'bad roo'.
Unfortunately, in the world of backyard chicken flocks, roosters only serve 3 purposes.
1. protect the flock (he's protecting HIS flock from YOU)
2. fertilize eggs
3. enhance your 'chicken keeping' experience with their beauty and stately manner.
There is no place for a roo who is making your life miserable (and dangerous) and doing damage to the hens. Those girls work too hard to put up with that sort of nonsense.
My first roo stayed WAY too long. He was like yours. All my hens had bald backs - I bought them saddles because 'he can't help it and he'll calm down when he gets older' Some of the hens ran from him, one got a bad cut from his spurs. He started 'stalking' me and then attacking me. I tried EVERY trick discussed on BYC. No difference - at all. I finely took him to a swap and made sure that I told every single person who asked about him that he was mean and was being sold as meat. The day after the swap I made arrangements to learn how to process chickens myself. I like having a roo in the flock. I like how they look and how they sound. Right now I have 3 young roos. As long as they behave, they are welcome to stay. The day one comes at me, he'll be in the crockpot.