IMO - Innova is a very RICH food. I too did the 'slow switch' from Euk. to Innova when I first got TJ and Roxy. I didn't keep them on the Innova for very long. I could tell by the Smell, Consistancy and Frequency of their poops that this food was way too RICH for their little tummies and digestive tracks to handle.
I have tried many high quality dry foods - my favorite is Canidae
Best of Luck!