You mentioned some of the thing you are feeding, do you also offer conventional feed? Either store bought or whole?

We use something similar to the Salatin mix which I think is 3-corn, 2-soy, 1-oat. Obviously corn and soy can be replaced by similar nutrient/protein mixes.

When ours have a feed mix available we can more easily see what they are eating more of i.e. what they are deficient in.