My BS6 is with zobel, used expensive resistor and ceramic capacitor, tubing is also as per advise in this thread, I think I made all as if should have been made, not my first set of IEMs.
Try calming CI with come resistors. 15 ohm was enough to pair with ED, most of the midrange comes from CI also. It is actually a pretty good driver with enough mass to produce full sound and big headroom. I also noticed that dampers above brown really messes openness of the sound and I try to avoid using those unless specifically requested by design.
My preferred sound would probably be L shaped - I do not like active high frequencies. Recessed mids are also not my favorite. I'd say HD650, meze 99/empyrean would have my favorite sound signature.
I did try scary build (2xCI + TWFK if I'm not mistaken), but the whole setup is so bulky I did not manage to fit it into the shell
Only tried them with test shell where back plate is fixed with whiteboard sticky material and is sitting 10 mm outside where the original plate should be. Did not listen to it for a long time, but my recollection of it is not too great. Now I have 4 CIs to play with