No experience with KZ iems in particular, but you might want to try the Moondrop Chu 2 (very good for the price, metal shell, but the brass nozzle will oxidise and get clogged with green bits).

For a higher budget, you might also want to check out the Truthear Hexa or Pure, and if you like the Moondrop sound, the Aria 2 is also a good option.