Too much vinegar? I can go out dump it and use a lot less. I tend to over do it.
Unfortunatly, no- he just pulls their tail feathers out. Sometimes these 2 hens can be sitting on a roost, and he will randomly go by and pick their fluff out of the front of them. Its just these 2. Before it was just one, now he picks on two. They still gather around him, and I have seen no blood. He makes them jump when he does peck at them.
brwneggs, that sounds like way too much vinegar to me. I use a 1/4 cup of ACV to 7 gallons of water.
With regard to the feather loss situation, is the rooster pulling the feathers or are they losing feathers as a result of being held by his feet during breeding? Most feather loss on sides and backs are a result of breeding technique. My rooster is reasonably gentle with his feet but he does hold the hens by the feathers on their heads resulting in his favorite starting to look a little bald. While my hens don't need saddles I may have to see if I can outfit them with toques