Yeah, I agree that it will became brighter in time when push to the max (3D),but it is not bad thing for most of the headphone, will try it on Soundmagic HP-100 when my unit have come (People claimed this is a bright headphone as well), but the soundstage is improved significantly, and the 'space' now can be more present, which is not a bad thing at all.
Xbass is a good feature, for some headphone that I think bass is not sufficient to make Jazz and Hip hop enjoyable, turn it on and welcome the new world.
iCAN is SUPER POWERFUL,haha.. I agree with you, that is why I think that if you want to pair it with IEM I think won't be the best match.
Hope to hear more from you again man :D