You guys are such mod amateurs.
Professionals like me take out the HE-500 driver all together and throw away the uselss pads, grills, cups and headband and then mount the planar driver directly onto the ears. I've soldered them to my ears now. There was a little bleeding, but the sound is well worth it. It sounds way more open now.
I also keep my head inside a drawer to prevent dusting, but it's hard to close the drawer all the way because of my neck.
No love for LCD-2s, I'll take em.