I did some more experimentation regarding this project today, with damping and loading. While I need proud papa syndrome to wear off before I can make a useful comment about the sound, I think we may have something quite viable. Suffice it to say I was head bobbing and found myself putting the experimental cans on in place of HD800s without being terribly let down. The sound is different, but that is not necessarily a bad thing. In fact there were some things I liked better from the experiment than I was hearing from the 800s. Bear in mind this is specifically with Crack as the source. With Mainline I suspect the 800s would walk away from the experimental cans, as they are being tuned specifically for Crack.
We have a couple of different cable samples on the way and some plugs. That will be the next step in experimentation. There are also some different pads on order.