I think they'te 2-3 months old, barred rock. Not laying yet.
Discussion
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.