At some point you are going to have to pull the trigger and actually get something. Don't get caught up in what's known as 'analysis paralysis'. Trust me, it's very easy to do, because I often suffer from the same behavior (from my career to investing to buying cars). And I mean that in the most honest, nicest possible way.
All of the IEMs you listed are pretty much regarded as the cream of the crop for their respective price points, and are very very close to one another in terms of sound, features, design, etc - CH9T, K3 Pro/HD, F9, etc. Of the ones on your list, it's literally down to splitting minute hairs.
There is no 'perfect' IEM. One might have better sound but may not be as comfortable for your ears. Another may sound 99% as good, but has better fit and a better cable. And since we all hear things a little different, even if someone else A/Bs them it doesn't mean you'll hear them the exact same way. You can't just go solely on manufacturer's FR graphs and a few people's impressions.
There will be subtleties between them all that may never have been pointed out in other people's impressions. Maybe their ears aren't the same size as yours. Maybe they are a different age than you so their frequency hearing is different. Maybe their ear canal is shaped different so there are reflected resonant frequencies present or absent that you wouldn't have in your ear canals. And that's not even considering what tips, what cables, what source, and/or amp they are using (as well as how well those sources are impedance matched, which appears to be the cause of the majority of the polar opposite impressions people give to the ZS5).
Just get 1, 2, or all 3, evaluate them all, pick which one YOU like, and send the rest back (or sell them, give as christmas gifts, or whatever).
You've been on the fence for months and months. I understand that you want to do your homework and you don't want to make a bad decision - no one does. But trust me, you can spend the next 24 months analyzing the same handful of IEMs and never be 100% sure about any of them if you can't listen to them for yourself in your own ears, on your own gear, with your own music. Wouldn't you rather spend the same 24 months enjoying music?
A lot of people dislike the ZS5 (including you). I happen to love mine to pieces. Is there a singular reason or explanation why? No, it could be due to a dozen of different reasons, from tips to source to hearing to quality control. Does that make 1 or us right and 1 of us wrong? Absolutely not. But just as you discovered with the ZS5, the only way to REALLY know if a headphone is right for you is to try it for yourself.