If you have time to devote to training, learn 2 proven nonviolent corrections for bad behavior: The 5 Yard Penalty and the Penalty Box.
The 5 Yard Penalty: Rooster does something of which you do not approve. Pick up the rooster and put his head under your armpit, holding his body against your ribs like a football. Don’t suffocate him, just pin his head. Proceed to march briskly around the yard for 5 minutes, then release him.
The Penalty Box: If the 5 Yard Penalty fails to correct your rooster’s behavior, get a laundry hamper, preferably one an “occupant” can see through. As soon as your bird requires correction, place him under the overturned Penalty Box. Leave him there until he stops pacing. This is most effective when done in sight of his hens, it is shameful without endangering his place in the pecking order. The hens might come over to comfort him- let them, but do not release until his aggressive body language is gone.This technique is most effective of all if the errant roo is “boxed” in close proximity to the feeder and must watch the others eat.
Please remember, there is such a thing as good negative correction. However, you must NEVER hit or kick a bird!!! They are very fragile, extremely susceptible to broken bones and internal injuries, and they feel pain so intensely it shortcircuits their cognitive function, meaning they will never understand why you hit them. (This is a natural behavior somewhat like “deer in headlights”, which protects prey animals from suffering excessive mental trauma when attacked by a predator. In essence, it is a “fight or flight” response evolved to help them die quickly.) Also, an injured bird, having abandoned higher reasoning under nervous stress, will instinctively imprint that YOU HIT HIM, permanently re-categorizing you as “dangerous menace” instead of “caring and useful provider of food and shelter.” This will only make matters worse, and inevitably the roo will end up in the old stovetop bubble bath.
Don’t lose hope! For the hens’ sake if nothing else, a rooster will learn to behave. You haven’t described a psycho-roo, just a good attentive flock leader with a few issues in threat assessment. Please work with him. God bless and good luck!
