I have seven 22 week old pullets and four 18 week old pullets. No one is laying yet, but some of my older girls look like they could any day now. I've read it's okay to switch to an All flock Feed (18% protein) with free choice to oyster shell. Just looking for some additional feedback to make sure this is okay. I'm almost out of my chick starter feed and would like to switch over when it runs out. Thoughts???