Whoa Lori. It sure sounds like you have quite the little spitfire there.
I agree with Jen in regards to completely separating them during feeding time.
One thing I would suggest is not to put Moxie in the cage, but Decker if need be. Also, no more real feathers either. What a little hunter.

Good luck with your little spitfire and I hope that he grows out of this real soon.