Bingo.
Learn about what design decisions influence your preferences and you will become a
much smarter consumer. In my experience, the CX400BT (which reviewers claim are sonically equivalent to the MTW2) have way too much midrange energy. I don't want to believe Sennheiser carried over their classically stereotypical "veil" to their TWS, but it's highly possible that something about that EQ treatment just produces very rich and addicting vocals. Sadly falls apart in a lot of other categories Doesn't mean they're technically incorrect for having that veil; just means you should be aware of what effect it will have.
The Technics, on the other hand, have virtually no bloat from the midbass through the midrange (though you can re-inject some of it by activating ANC or HearThrough). That's why they have a little more sparkle and sense of air around all the instruments. The tradeoff is real, but that doesn't mean one headphone is
Unfortunately, this hobby has a ton of subjective language that has been adopted over the years as a means of objective measure. To date, I cannot find a consensus among more than two people what they feel "good" soundstage is. Most have been misled into thinking they need to hear a speaker-like positioning on a set of in-ears. Can't defy physics, man. You can have fun with certain psychoacoustic tricks, but it's still a battle of physics.
For the IEM? Haven't found shallower than the DUNU DK yet. Especially with some Auvio wide-bores, they're just pillows sitting in my ears. I cannot believe they can fit 4 BAs and a DD into these shells. Barely looks like there's room for the DD as is.
Moondrop Starfield will probably have a shallow fit similar to the Kanas Pro and are potentially easier to drive. Which you decide on is going to come down to whether you want Harman
warm or Harman
new (or VDSF, according to Moondrop themselves). I tend to favor the Kanas Pro, but they have a very specific sound signature and warm sources can make them outright syrupy on some material and need a fair amount of power to really wake up the DD inside. May not be the best combo. Don't want Harman at all? Don't do Moondrop; it's their thing.
Perhaps the MEST MINI if you're willing to give bone conduction a shot? They use QDC connectors (2-pin with a bulge instead of a recess), but a little secret: they'll work just fine with standard 2-pin. Not everybody's a fan of the tuning, though. Maybe used is the way to go there. Shooting myself in the foot if I decide to get these later, but here's a really good deal on 'em:
https://shop.musicteck.com/collecti...ver-hifi-iems-like-new?variant=39321125355582
Not sure what else there could be aside from those two, but my P1 should arrive tomorrow; I imagine they'll probably end up in the "medium" depth category, relatively speaking.