Royal Canin kitten then young neutered male works fine for Chaos (Hills didn't), you should try another type, sometimes it takes a bit of time to find the one that'll work

I feed my kitten Natures menu kitten food (wet) and orijen biscuits. Im weaning him off Royal Canin as it has alot of fillers in that dont help delicate tums. Try to avoid dry foods with maize, corn and wheat in.

organipets is another good dry food. Im going to try my kitten on applaws kitten food (wet) as Natures Menu is going out of stock in my area, im not keen personally on feeding alot of dry food.