I use layer feed that contains animal protein--it's listed on the bag as "porcine". There is no "mad chicken disease" and frankly, they will eat each other if given the chance, with no harmful side effects. I make a point of buying feed that contains animal protein, though it's getting harder to find it. They remove that ingredient but never tell you on the front of the bag-you have to read labels every time to see if they've gone veggie.
Flock Raiser is made for all fowl, so why lower the protein? Ducks are part of whom it is made for. As far as chickens, I often use 22% layer pellets for my birds, especially when they are all molting. I do not use Flock Raiser because it's vegetarian and too expensive anyway. I do sell eggs from time to time and folks like that I don't use antibiotics on my birds. The organic thing is sort of weird since what is more organic than bugs and meat? I'm not changing my birds' feed for the customers so if they have issues with that, they'll need to go elsewhere.
Any good quality all purpose feed plus supplemental calcium is fine.