1. Treat the ceiling above the kit so it's not directly reflecting sound from the drums straight back at the mics. These reflections can cause phase cancellation and mess with your cymbal sound. Also, keep the kit as far from any untreated walls as you can.
2. Lose the Z customs - they are horrible recording cymbals. A customs are fine, as are K customs, Sabian AAX, and other equivalent cymbals. Also, keep in mind that any cracks in a cymbal can ruin the way it sounds.
3. Make sure the drummer isn't hitting the cymbals too hard. It's better to go for power and consistency on the drums themselves and a bit of finesse and balance on the cymbals.
4. Try using HPF/LPF on the cymbals to tame any excess lows or highs in the cymbal sounds. Do this as a last resort.