Owls have very sensitive hearing, I wonder if there's a sound repellent you can use? I know most "bird scaring" products revolve around producing predator calls or prey distress calls... which probably wouldn't help. There are also strobe light machines which can disorient birds- but again that...
They might attack a full grown peafowl, but the avoidance of the coop makes it sound like you may have a ground animal problem. Have you set a live trap?
Some people have had success with placing red jewels in the grass in pairs to look like eyes. Do you have any flock guardians, like a dog...