I recommend target training. It's perfect for aggressive birds. I practice it from my bird trainer. What you do is find a "Target" or something like a kabob stick or chopstick and have a go.
Here's a link: http://www.birdtricks.com/blog/single-handedly-target-training-your-bird/
And another thing, I wouldn't say it's hormones, it sounds more like a territory thing, because covering wouldn't do a thing for territorial issues. Especially if females are involved. Try some target training, it should help curb all kinds of behavior problems. If you have any questions on target training, feel free to private message me
Here's a link: http://www.birdtricks.com/blog/single-handedly-target-training-your-bird/
And another thing, I wouldn't say it's hormones, it sounds more like a territory thing, because covering wouldn't do a thing for territorial issues. Especially if females are involved. Try some target training, it should help curb all kinds of behavior problems. If you have any questions on target training, feel free to private message me