I’m sure you’ve done amazing managing this dog, but I wouldn’t want it in my house where it could hurt my kids. You have a very serious problem, and I don’t believe protein level is the answer, but all the food dyes and artificial ingredients could be part of the problem.
Aimee’s suggestion of professional assistance is right on the mark. It’s much better to spend a little money now and learn how to fix this problem than to continue trying to manage it and fear the one time you fail. Please take the extra time and effort to help your dog before it’s too late.
