Layer Mash

So I have been purchasing my layer mash premixed from my feed mill. Which has been find but is seems they have switched to using soymeal and bone meal and a few other things and the consistancy is very powdery. So I am thinking I would like to mix my feed in batches of 500. How would I modify my current broiler feed to work for hens.

Broiler Feed Med Roll
515 Corn
300 Roasted Beans
110 Oats
4 Egg Innovations (Vitamins)
10 Poulty Pellets
5 Kelp

I know I need lime or calcium.

But what else?

And I am not sure if I need to change any of my other weights.

Thanks