We've been switching from soy based organic feed to making our own using Garden Betty's spread sheet for calculating percentages of protein, cost, etc.  Very helpful tool and I recommend it for anyone wanting to make their own feed.
 
http://www.gardenbetty.com/2014/11/...culator-for-determining-your-protein-content/
 
So after reading about a million posts and threads and websites it seems like if your birds will be confined totally, then there needs to be a perfect homemade feed.  If they can free range, as ours can, it seems reasonable to relax on the perfection and shoot for diversity and approximate protein.
 
My feed recipe right now is this:
 
2 parts each:
Boss  (.36/#)
Whole Oats   (.12/#)
Hard whole wheat (only because I had a 50# bag and we're now gluten free. Cost?)
 
1 part each:
safflower seeds (?)
organic cracked corn (.42/#)
brown lentils (.75/#)
 
The BOSS and the whole oats will be the mainstays of the recipe with the other things changing as available, price, etc. 
 
This is a 16.9% protein feed for .41 per pound compared to the soy organic which was .52 per pound. 
 
We do ferment this which boosts the nutrients.  Also there is kelp meal free choice along with grit and oyster shell free choice.  The commercial feed was 16.6% so we're in the ballpark.
 
We have 7 Ancona ducks and 5 guinea birds and they love their food, except no one loves the lentils.  They do get eaten but it's not their favorite ting for sure.  Next batch I'll try grinding them up instead of feeding whole since these are the protein boost for the recipe at 26%.
 
So, this is what they've been getting fermented along with the commercial feed.  As of today the commercial stuff is gone so we'll see how it goes!