Hi, welcome to BYC!
I just noticed you are new here. It's a great learning and sharing community! Lots of people have different ways that work for them. So I am just sharing my experience.
All flock with 20% protein is what I feed to my mixed age and gender flock. The calcium to high for non layers can cause kidney issues. You are the first I have met to actually experience it though. I like a little more protein to help grow feathers when molting. And it would take EXTREME...