I eq'd them with wavelet and it reduced the peak a fair amount.

Fair enough, but how many of these are as widely available as the KZ? Genuine question.

(And I do not mean just the US or Europe but actually globally)

Can you make a better IEM for the same price? Or are you going to buy people new gear?

No, the ZSN Pro X isn't great when compared to other IEMs. Even I want to upgrade to a Moondrop Aria.

But my point was that it is good for its price point and will satisfy the vast majority of users, at least for a while until they decide that they want to upgrade. Which, some people don't as they feel content with it.

Don't put down other people's gear just because you were blessed with the fortune to be able to spend large amounts of money on yours.

Understandable.

I don't know how long you've had the KZ but just know that the silver cable is gonna look nasty after a while. There is a cable on Linsoul Audio that's black and can even change termination iirc. So you could switch to and from 3.5mm and 6.3mm jacks.

The ZSN pro X is a great, inexpensive IEM to start off with. But I'm a little confused with your other choices. Why two separate pairs of overears and why 4 separate devices at once?

You could have purchased a higher end headphone that blew the two (sennheiser and akg) away.

Though I personally would buy airpods pros(or any apple product) I understand that you might want noise cancellation. In that case why even bother with the IEMs?

Ultimately it's your money and I have no right to say what you should and shouldn't do with it.

Edit: OP might be a musician....