I have tried so many foods over the years and an mow with Science Diet mixed with Pro Plan and Nutro Max.
For canned I use the Our Compliments , especially the Turkey and Giblets which with water is waht Michael LOVES.
Since Zen is a New Kitten you can go to purina.com an enroll Zen and recieve a free 3.5 pound bag of Pro Plan Kitten and a 15 pound container of premiuim Cat litter.
I would call Science Diet 1 800 445 5777 and Nutro to see what coupons they might send for Zestful Zen!