Ok, so I decided to do a mod to my HRM-7's (cringe) I opened them up and wasn't quite satisfied with Pioneers' choice of damping materials:
So I replace them with nice solid Dynamat:
Soundwise what I'm hearing is a TON more clarity in the mids and lower mids; they're absolutely magical now. They're also brought forward. Bass has a bit more weight to it but it's tight and defined. That's with the stock pads. With Hifiman pads you get even more bass, but you sacrifice a bit of the soundstage. I haven't tried these with my Alpha Pads yet with the dynamat mod, but I will later today.
edit: I'm playing these side by side with ATH W1000Z's, Alpha Dogs, and Nighthawks and the edge they had in detail retrieval is now gone, I'm going to call these mid-to hi fi cans now with a sound worth about $500 at least.