I have 13 pullets and 2 cockerels that just turned 16 weeks. I have been feeding an organic grower/broiler feed which I ferment.
 
I came to this thread because I was unsure about how to feed once the pullets started laying; stay with the broiler feed and offer oyster shell on the side, or go to a layer feed and hope for the best for the males. The more I read, the more confused I got, especially when I followed that link to Hyline.com - way too "big breeder" and scientific for me!
 
These are just heritage breed backyard chickens which I plan to use to supplement our table with meat and eggs. I'm hoping to brood naturally and keep my flock together. 
 
Right now, I am leaning towards keeping them on the broiler feed and offering oyster shell on the side. I use Countryside Organics and they don't offer a Flock Raiser, just the broiler/grower, chick starter, and layer feeds. They get fruit and veggies daily and we are getting our yard secured so they can free range a bit more. 
 
The broiler feed is 19% protein, the layer is 17%. It is my understanding that fermenting the way I do raises the protein levels a bit further.
 
My question is: should I even worry about the higher protein since they get a varied diet?