Major shout out to Casper - he sent me, as did Fearless1, a bit of Dynamat to Lawton tune my D2000 cups (the Martin Custom Cocobolo Rosewood cups which were extra deep, and honestly, a bit extra boomy). Took them apart after listening to one of my bass test tracks, got busy in the garage and within a half an hour had them put back together. Fired up the same track, turned it up and got that stupid smile on my face. Success!
Honestly don't know who originally came up with the idea of using Dynamat to sharpen up the bass, but it flat works gents. The headphones are now the equal of how it was with the stock cups (which had Lawton tuning) and now the looks match the sound. But imagine a deeper D2000 that has no boomyness - that's what I have.
You're welcome! I'm glad you got the sound you were wanting out of them!