If you're looking to add blue egg genes to your flock, Cackle's Black Ameraucana is a large bird with large blue eggs. Their personalities seem calmer than the Easter Eggers.
There are too many roosters in your flock. (I learned this in my flock this past year, with help from this forum). How many roosters do you have total? They say you only need one per 10 hens. If it were me I'd keep that "nice", sixth roo (I'm guessing he is the dominant roo) and butcher the...