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I use the Kalmbachs Flock Maker, 20% only because our TSC doesn't stock crumbles in all flock, but they have one in pellets at 17% protein.

You're fine to continue using up the chick starter and doing exactly what you're doing with the calcium. Then I'd switch to all flock. Maybe go a little less on the scratch so they get more protein in the feed would help too.