I've had the same thing here with a young Roo, he's about 8 months old now with raging hormones.
I've tried to establish dominance with him from day one.
We rescued him from a rabbit pen last November, and have been using all the techniques I've read about here but
he seemed to always challenge the weak.*(even if they are 250 lb men lol)
I keep reinforcing the men around here to not be scared of the 7lb cockerel to not back down.
And I thoroughly like hearing him crow.
Anyways yesterday at 10

oam dogs came into the yard unbeknown to me.
This is the second or third time they have been here in the last two weeks.
(Our dog is usually tied out when the kids go to school in the morning
but not this day or he would have been loosing his mind)
Go outside when I hear the distress to see Our Roo=Claude laying lifeless
and the dog plucking feathers off his tail end to get to the meat.
Chase the dog off and Claude gets up slowly, missing a pound of feathers.
I go over to the coop with this awful feeling see my favorite girl dead, not eaten no blood just killed.
See a pile of white feathers from Claude our roo, who I know fought hard for his girls all over the yard.
Look in the coop, two of our girls were in their nest boxes laying and hiding.
One girl still missing, she came out of the woods several hours later.
Claudes heart grew 12 inches that day for he did his job and was willing to protect his girls till the end with his own life.
I love him even more now and I think he's come to a better understanding of what a real predator will do.
I knew he would be fine as soon as he saw his girls again and chassed her down to nail her.lol
I did clean up his small wounds and put triple antibiotic ointment on him so he is not out of the woods yet.
Now my ole man sees him with new respect.
And I hope it mellows him out.
Wonder if and when his feathers will grow back....?!