I too feed grain free, I use Merrick Before Grain. Choosing a food can become very overwhelming. It seemed like the more that I read, the more confused that I became. Just like with a skin baby, not all foods are going to work with everyone, and it was a trial and error process for us. Just remember whatever you decide to try, make sure that you make the transition slowly, and if one thing doesn't work for you I would give it at least a week before I tried something new.
Jeri and Harley