@Cindy in PA
Why not just supplement with a product like Farmers Helper Ultrakibble? It is a high protien supplement from fishmeal I believe protien content was around 27%.
Also readily available off the shelf.
I have tried that in the past & it didn't seem to do much. also don't like that it was mostly corn gluten meal after they made it soy free. There are all sorts of things that can be used to supplement protein. I would prefer to feed one feed with everything balanced in it & around 18% protein. Feeding a mix of pelleted feeds that brings the protein to 18% is preferred when I can't find an 18% protein layer. Just would be easier & closer to a regular 18% layer feed. The problem has always been finding an organic pelleted feed with more protein & if I decide to raise the protein in my layer, that is what I can finally do.