hello,i just read your post and i would suggest trying the natural balance.i have a 14yr old cat with a very sensitive stomach.this food is the only kind he has not thrown up.he has been on it now for 5years and it has nothing but good ingredients.they have different types to try,so one might work for your kittys.petco stores carries there brand.there web site also has great info.good luck and i hope this is of some help.www.natural balance.net