Weird impedance issues aside, I think I've identified what irks you about the BA200, buggalugs.
Regardless of whether you listen to JPop or not (I actually don't listen to it all that much), check out BoA's 'I SEE ME' --- it's a single that Audio-Technica made into their promo for the Pro700 Mk II, and features lots of sparkly bits and cymbal hits. I tested this song in lossless against all of my IEMs, as well as my full-sized, and found that, yes, the BA200 positions the cymbals and sparkles way in the distance, while all the others have it much more forward. The BA200 makes up for this distance with depth of soundstage. The sparkly bits are supposed to travel in a circle around your head, and whereas the DBA-02 made them feel like a straight up linear pan from side to side (the GR07 is slightly better, but not by much), I could actually feel the sparkly bits travel in a noticeable oval around my head. At the same time, I felt the DBA presented the cymbal crashes a little too prominently for the occasion, with the GR07 having the most suitable presentation for the cymbals.
In my opinion, at least, the BA200 acquits itself for slightly less treble detail by presenting a much more three-dimensional soundstage.
YouTube version of 'I SEE ME' (Click to show)