Awesome, 10/10 review. For some reason these are my favorite KZs despite having the ZST X, DQ6 and ZEX. Still love my Blon 03's a lot too.

Maybe it's my mind playing games, but they came trough next steps:
- very bassy and harsh from box,
- after week of burning peaks are stand tolorable, bass not feeling this much as on graphs, but still overall harsh on 5-7 kHz, and IEM comes to burning farther. They sounded still not very pleasing,
- after month burning i changed wide bore tips on KBEAR 08 silicone eartips and ... they sound like normal IEMs.
Imaging, separation and other audiophiles stuff still on beginner level, but tonality, timbres is OK, bass has decent speed, not boomy, harshness don't bother, vocals raised from dead, and (when they in good moods) they even can play some metal (like Pantera, Iron Maiden, Scorpions), not only slow songs with 3 instruments as before and this is ... not bad.
I don't know what is: long burning, tips or changes of hearing (you know - yesterday that was my favoutite IEMs but today i don't know which IEMs can sound worst), that we all have sometimes.

@Ulisses Sounds like you got used to it, AKA Brain Burn in.

Yes, this happenes. But not this time. I didn't listening to them 2 months.