Will have to take note on the bass between the two.
However I will say, the bass takes a focal point-dead center in overall staging, these coreir brass tips sounds airy. to my ears I find that it's much easier with tracking the direction of sounds with some songs, definitely a 3-D sound where I can track some sounds surfacing from behind my head and top back.
Edit: I still think the original stock tips sounded the best in terms of spatial sound quality and music depth, but they're not comfortable for me and the seal was terrible. I feel like trying any smooth silicone tip in the future will have the same issues for me unfortunately
The COREIR brass has deeper bass where it's more pronounced and textured, very tight and controlled at the center staging. The treble is more energetic, sound lingers much long, hence the reason I can track the directions of sound better. They sound more 3D while the xelastecs sounds more like music in your head.
They make my azla tips sound meshed and inferior now, most likely that the bass bleeds a bit. The dunu SS have just as clean sound as the Coreir brass tips but staging suffers, I can really tell where music tapered off, and it doesn't give the 3-dimensional qualities. Wow I really love this hobby, it never ends does it lol