Alright well we are a week or so into the switch of the new food. Blue buffalo chicken is what we put him on. Not my first choice but my fiance picked it out. Jack likes the new food, he's never been a picky eater and just recently the itching has gone down BUT it also snowed and then melted causing the humidity to rise a little, so I want to wait for a few dryer days before attributing that to the food.
Oh and I should have mentioned that I was fairly certain he wasn't allergic to chicken since I make homemade chicken feet treats and he loves those and never throws them up.