This is what I use as a compromise between sub-par layer and very high 22%. I had been using 22% based on BYC recommendations but my local chicken lady where I get my chicks (she formerly worked at Privett,) argues with me that protein to high is also bad, it can cause them to grow to fast and have reproductive issues. So... I split the difference with 20% Kalmbach....20% all flock here, all chickens, all ages. Oyster shell on side.
Currently buying Kalmbach Flock Maker, they love it, never waste any.

