I've tried 8 or so chi-fi IEMs. For me, it's just to see for myself what some of the buzz is about, but at the end of the day, I don't choose to use any of them for playing out regularly. The only model among the buy-and-try IEMs that was meaningfully separated from the others for playing out was the KZ PR1 and PR1 Pro (I got both and to my ear, regardless of what the youtube reviewers say, they're about the same). I played at rehearsal and out with them a few times both with amp and ampless (full band twice, pub band and "acoustic" trio), and to me, they seemed the most natural, warm and smooth sounding complete replacement for an amp. What I mean by that is giving the feeling of not being sure if I'm actually hearing/feeling the amp if there's one there. The isolation for stage use seemed as good as any other universal I've tried.
Here's a post I made when I got them that you might find of some interest...you might not
https://www.talkbass.com/threads/kz-pr1-pro-planar-iem.1598265/#post-27295448
All that said, I believe that our hearing is such a subjective thing that neither I nor anyone else can necessarily tell how your hearing and preferences are going to find the results of what are technically/measurably marginal differences in various budget IEMs. You mention an "upgraded" cable...if you're someone who hears a difference between two properly working cables, while I can't argue about what you hear, you are hearing a difference that has no technical, measurable or testable reason behind it and is something that most other people don't hear. So, what "might be better performing than the ZS10 Pro"? Just about any other model might have potential. But not to say that you won't or don't hear a difference, in fine details of sound, you can't hear what someone else hears.
For me, rather than trying to take anyone's word as gospel, dropping $30 here or $60 there on these to be able to try for myself isn't really any skin off my nose, especially when I get on Amazon and find out I have enough points to cover some or even all of the cost.