Totally agree. Good to know, I didn't realize they made it as a CIEM as well, why do you tell me this stuff? haha.+1 to that, as I'm a big fan of the Kublai Khan as well. It's so well-extended on both ends. I'm glad you got a good fit with it, as I think that's the key to making sure it sounds the way it should. In this case, a good seal is just not enough, as the shell needs to mate with the concha in order for the BCD to do its work... which probably means that a custom Kublai Khan is the way to go if at all possible.
p.S.
i didn't introduce myself, but I did recognize your voice from previous canjam preview vids. it was awesome to geek out over the kublai khan with you at the end of day 2. We also talked about the stage 3.