@ohhgourami So I think I found something kind of huge! Your idea of covering the inside of the Audeze velour pads had me thinking why does that work? Then I realized that,similar to the fuzzor mod, you are trying to get rid of hard reflective surfaces. The leather isn't that hard but it still will create unwanted reflections. I was rummaging around with my modding materials and stumbled on an old mouse pad. I got thinking...what if I used rubber to dampen the outside of the cups between the grill and driver? I tried it with ~1/8 inch strip of rubber, enough to cover the plastic but still be able to put the grills back on. I put them on and WOW!
I had been using the stock grills because the "open grills" made the treble hotter and more etched. After this mod, the open grills sound fantastic and the treble is soooo smooth and realistic. Also, due to less reflections, there is an added benefit of a clearer picture and increased resolution. Give it a try and let me know what you think.
Edit: Just to emphasize how much of a difference this makes, I had been using the foam inserts from my Beyer DT880s to take the treble edge off. After this mod, I took those things out!