The owner of the MKII did send lots of tips including sony hybrids and some triple flanges. There were few that had some foam kinda material inserted in the tips. Except for triple flanges all were good and comfortable. Didn't find any significant changes. Yes, if deeply pushed into the ears the mid brightness is bit tamed but still easily noticeable. That section feels grainy and sharp and not at all coherent with rest of the warm sound. Unless there is a driver/sonic difference between MKI and MKII, i think we are talking about the same earphones.

Sony Hybrids have a bore that's too big and are impossible to allow for deep insertion unless you are King Kong.  Grain, sharpness and incoherence mean you have a less than ideal seal/fit.  The mk2 does sound a smidgen warmer than the mk1.

I guess we could ask stratocaster if he experiences any grain, sharpness or incoherence.

Proper fit should have the DBA's housing pretty much disappear inside your ear canal, meaning you can barely see it poking out.  Plus a small bore helps to even out the FR and any nasties.  It's okay if you have a fit issue, just use a different phone.  Not everyone can wear every phone out there.  I have issues with discus style IEMs like the DDM and Sony EX series.  Others can't even fit customs, especially if they have too many drivers.  Just the way it is.

Proper fit should have the DBA's housing pretty much disappear inside your ear canal, meaning you can barely see it poking out.  Plus a small bore helps to even out the FR and any nasties.  It's okay if you have a fit issue, just use a different phone.  Not everyone can wear every phone out there.  I have issues with discus style IEMs like the DDM and Sony EX series.  Others can't even fit customs, especially if they have too many drivers.  Just the way it is.

Yeah, definitely not to the level that the housing would disappear. But the seal was good, in that i could feel the air pressure. Bad seal affects bass too , but the bass was fine quantity wise. Not at all bass lite.
I am not into IEMs at all but had a curiosity for BA. Anyways, it took only 10-15 secs to identify upper mid sharp/tizzy elevation. The sound sig is smooth and for the most part FR is sane so it doesn't hurt ears as much as those that have broad upper mids/low treble elevation