Taycie has a horribly sensitive stomach. I have have wonderful success with NB Limited Ingredient Diets. Natural Balance has quite a few options and she does well on them.
Recently, I have decided to start to homecooking. Taycie was sick a couple of weeks ago and of course she ate chicken and rice. Everytime I feed this to her.. I LOVE the results. But, to do this long term and correctly you need to have a board certified veterinary nutritionist formulate a recipe. I am going through
http://www.petdiets.com/
I am still getting my things together and will be making a switch. Good luck! I know how rough food trials can be. I know RX diets get a bad rap, but it may not be a bad idea to try it. There are alot of science behind them and I know they have helped many sick dogs.