Aggressive Roosters CAN BE TAMED. I've had several aggressive roosters and have tamed them all. What you need to do is to teach them who the Alpha Rooster is - and that is you. Do not run or back down from them. Wear gloves & long sleeves to avoid getting scratched. When the aggressive rooster approaches or attacks you - you MUST catch him. Easier said than done, but you must catch him whatever it takes. Have a net or blanket nearby, so if you need to throw a blanket or net over him to catch him. I always go for a leg, if you can get ahold of a leg you are good. He will struggle and try to get away, but hang onto him. Then pull him up and hold him tightly against yourself. With arms firmly around him. His side should be against your midsection. Hold him until he calms down, walk around with him, sit with him all the while keeping a firm grip on him. When you can take one hand off of him, stroke his head and back and quietly talk to him. You must do this each and every time he comes at you, usually only takes a couple of times, before he views you as higher up in the rooster pecking order. You can hand feed him a nice treat like meal worms, tomatoes or corn on the cob. My aggressive roosters are now docile and never attack me or come at me aggressively.
Though you say you've had some success and I'm happy for you, in my opinion, they were not 100% into their aggression, not genetically programmed to that temperament. There are
so many folks on BYC who've done
exactly what you said with no success; the truly aggressive males never change, not permanently. And if you breed from them, you usually get more of the same, unfortunately. I did that with one, tried quite a few things to change him, but when he flew off the roost at someone's head, he was stew the next day. His genes did not need to continue.
We had a situation where one changed late in life due to a situation that necessitated us removing him from his hens nightly for a couple of weeks. He was a year and a half old, never even bitten anyone before this time. He became aggressive only to me, not my husband, no idea why since we both removed him equally. He became impossible to handle around me. I cannot deal with a rooster knocking me off my feet on this rock-and-root-ridden property since I'm prone to fracture, so a friend gave him a second chance, hoping a change of location would get him back to his normal self. He did flog her a few times but at least he was able to keep his head and live awhile longer. I tried everything with that rooster because I was attached to him, but nothing worked after something in his brain clicked.
Another situation that can change a formerly friendly rooster's temperament is a predator attack. I know of one that was
very calm and easy to handle, came out of my line of Barred Rocks, but after a raccoon attack that killed several birds in the pen next to him (he was owned by my best friend), he turned into a psychotic nutcase. He would attack doors if you were coming in, fly into walls, etc. He had to be put down because he became too dangerous.
There are other reasons for aggressive males that are not genetic, those situations that happen and make them different, but usually, if they are flogging by maturity, they just continue and no amount of babying or bullying or anything else can fix them.
The main thing I want folks to understand is that if whatever you do to "fix" an aggressive male does not work, DO NOT blame yourself! It is not your fault. You cannot re-vamp bad genetic programming and you don't need to feel guilty if your methods are unsuccessful.