If it weren't for that veiled/muffled sound, I think I'd prefer the the LCD-2.2 over the HD800 for deep-house and hip hop, but I see where you're coming from. A properly amped HD800 is a thing of beauty.
Having said that, the Fostex TH cans remain my favourites for bassy music, especially the dubbier genres that like that bit of reverb in the sub-bass, while still retaining open-headphone levels of airiness. They're the only cans that give me that sub-like punch in the gut when it comes to bass response. No idea how Fostex does it.
Comfort wise, the TH600/900 and HD800 are at the top. Both equally comfortable on my head. The HD-800 probably has a slight edge, simply because their pads can breathe a bit more in very warm weather and it's a few grams lighter. The open vs closed thing doesn't really play a part with comfort, me thinks.
As for mid-range "recession", it really depends on the listener. Some aren't that bothered by it, some can't live with it, and some love it. I actually find very forward higher/upper mids rather offensive and tiring, tbh - like with the LCD-XC I auditioned some months ago - but I've noticed that many people that listen to geezer rock bands and chick-with-guitar music tend to prefer that sort of presentation. Horses for courses, as they say. Amplification plays a part, obviously.
