I'm not the best with chicken feed but i do know that before you buy look at ingredients our ask the guy/lady from the store about it, we just use free range chicken feed, yellow bag, chicken picture
And be careful asking because sometimes the feed store employee might not know. Always read labels and do research. That's how I decided to feed my cats Innova Evo and they're beautifully healthy.
Make sure that your hens have access to plenty of greens. Mine eat loads of grass, silverbeet, spinach, chickweed etc, and I have rich golden yolks in their eggs.
I've definately seen a great improvement in the egg quality if the ladies have their free range access. When they were in the coop/run area and didn't have access to the back yard (I was getting pheasant netting to keep hawks out) the eggs were pale not as nice.
All back to lovely once the netting was up and the ladies went out to scratch and eat in their big yard.