Your report of the issue of shelved or lacking of mids and bit of treble touch is the problem I found on all Hifiman headphones except for the 560 which I have not heard and have no interest of hearing. Even running a loaned pair of HE-6 back then off some Denon POA-1500 and 3000 150-200+watt per channel power amps (and these amps are very well made with plenty of grunt) the HE-6 was still lacking compared to my old SR-Omega's and did not come close to the SR-009's I had on hand at the time, unlike the many folks on headfi claiming HE 6 + speaker amp = 009 killer. I admit there was some similarities but the level of difference wasn't even small.