Oh, I think I misunderstood your question. Mea culpa.
Rereading your initial post, I see you're looking for people's experience with these feeds. 🤦♀️ Must be past my bedtime.
That will tell you a lot. Go to the company website and see if they have nutrition specifications. I've added a picture of the label of what I feed, Kalmbach 20% Flockmaker. It has both corn and soy, so this is not the right choice for you.
I'm going to tag @U_Stormcrow to explain more about...