I've been doing a 50/50 mix of 24% chick starter crumbles and 16% layer crumbles - everyone really likes it and they are all doing well on it. (I can't claim to have come up with it - George Jensen recommended it in the absence of easily available/fresh breeders ration).
I give a couple handfuls of BOSS to each family/flock every week or two, more if they are molting or otherwise seem like they need it.
- Ant Farm
Is the 24% crumble a meat grow? Best find here is a starter of 22%. Since I have moved the pullets from their starter to the 16% pellets eggs have been smaller and fewer. Now it do get hot here and maybe that's the problem but now it's cooler again and eggs have definitely slowed