The "Scratch and Peck" brand of feed has whole grains and finely powdered supplements mixed together in the bag. That makes it very easy for the chickens to pick out favorite parts and waste the rest--which means they do not get the right nutrients, and it is also wasteful to buy feed that just gets thrown on the ground and lost. So fermenting the feed is a good way to make sure the chickens eat all the parts of the feed.
Several of us have already suggested that OP buy some kind of complete pelleted feed to leave available free choice, as an addition to the current feeding regime. That way the hens could have more feed if needed, while still eating mostly the Scratch & Peck feed OP prefers.