Regarding the MH1C, try making an EQ dip between 2 and 3kHz instead of the little peak I have now. They seem to have a peak around this region relative to other phones as part of their diffuse field equalization. It works for me (I even want more of it, to make vocals stand out more and gain more definition) but it may not work for everybody.
I did that the other day. I'll try it again later.