I moved mine off kitten stuff after they were neutered. If you want kitten goodness, how about a compromise, with kitten kibble and normal wet food? Incredibly cheap wet at the moment is Tesco Just Nature, 60% meat (lamb or turkey) for 22p. It was 52p for months now just 22p for some reason.

Tesco Luxury is also very good quality (50% meat)

Tesco Just Nature Cat Pate Turkey & Rice (100g) Price Comparison | mySupermarket