PSA-- acknowledging that there is a difference between "Eastern (ie., Chifi)" tuning and "western" tuning in IEMs does not make one a racist or imply racism. It has been a very useful distinction for me to make when it comes to trying to understand different people's tuning and listening preferences and where they are coming from when commenting on an IEM. I first encountered the idea a couple years ago on Discord when I was told emphatically and conclusively that the IER Z1R was a superior IEM to the Campfire Solaris because the former "makes my JPOP & KPOP sound better". A lot of what it boils down to I think is that much Western music (rock, rap, rhythm & blues, jazz, funk etc. etc.) has its DNA in the mid-bass & lower mids. Conversely a lot of Eastern music (JPOP, KPOP etc.) has much of its DNA in the upper mids/lower treble...and these different ideals are clearly reflected in different tunings of various IEMs.
IEMs tuned in the "western" direction often can sound "muddy" to those who prefer a more eastern tuning, and conversely IEMs tuned in the "eastern" direction can sound shouty and fatiguing up top (and somewhat thin down low) to those who prefer a more western tuning. At the time I first heard both the Solaris & Z1R back to back my ultimate preference was for the Solaris at the time in large part due to its increased mid-bass presence and that the Z1R veered into shoutiness for me at times (Creedence Clearwater Revival is a great example of where this can often happen).
Edit: Looks like it does not support playback on other websites...
For those interested -
Toumani Diabaté with Ballaké Sissoko - New Ancient Strings
Very rhythmic and cyclical Kora playing with strong L/R channel separation. Listening to this from my MX64 ear buds stage feels wider than Traillii but with exceptional DD timbre.
Edit 2: very glad you enjoyed the Traillii, I remember my first time...it was special!