The Chi-Fi scene is new for me as well. But I have the ZS-10 Pro on my ears as I type this. It actually has pretty decent fit, it's reported to be more comfortable than the old ZS10. Can't tell you much about the ZS-10 Pro quality, though, as I haven't spent enough time with it.
What you might want to do is take a look at CCA as well, because that is a sister brand of KZ that retunes their components into what are often softer or more natural sounds.
A new generation of KZ / CCA flagships just arrived, the ZSX and C12 are receiving positive reviews. And the 11.11 sale is coming up.
However, you might also want to look into the TFZ brand. Since you like soundstage and audio quality, you might want to consider the King Pro. It has maybe the best soundstage, detail retrieval, and imaging of anything I own. Downside is that it is a bit bright, and the tuning is not quite as natural as some of the better DD IEMs you can get.
Another, cheaper option is the TRN offerings. I bought a V80 last year for $26 that blows away anything in that price range in terms of soundstage and imaging, but it is a synthetic tuning and the mids are recessed. (If synthetic tuning is okay with you, also consider the **** **** for $16, people here like it for its technicalities). TRN V90 is now available, gonna buy it next.
People who are experienced here have been saying good things about the BQEYZ Spring 1 (not so bassy, but very good sound and allegedly BIG soundstage), the BQEYZ KB100 (deep soundstage, good separation, isolation), NiceHCK M6 (good separation) and NX7.
For what it's worth, I'm finding the ZS7 the most interesting of the 5 KZ/CCA that I own. It has juiced treble and bass, producing a more exciting sound, serious bass, and seems to have a better soundstage than the other KZ/CCA. Housing fit and cable are problematic, though.