I think you should be fine doing that, though I don't follow all the feeding rules that I see on this website, I am apparently a bit backwards, but my chickens are fine, do what you feel is fine, it's really hard to kill a chicken with feed, I have always added scratch to lower protein in their food at that age so they don't lay too soon, they still need to develop, and mature a bit, I prefer not to push my hens into lay, too early, I think that causes more problems, but as I said apparently I am backwards.