That's an interesting and timely post as you'll see when you read on below. Before that I'll just say that I'm curious about the W3000ANV's - the person I bought my HD 800 from sold them in favour of a warmer-sounding headphone and was purchasing the W3000ANV around the time of the HD 800 sale.
I've recently been finding listening with the HD 800 to be a bit fatiguing again and have been experiencing more ringing in my ears than normal after using the HD 800 a lot in the past few weeks, even at my low-level listening volumes of ~70-75 db. Yesterday I had the insight to resort to something I did a while back but haven't done for a while - EQ.
Armed with my HD 800's frequency response graph and a parametric EQ, I EQ'd my HD 800 to a flat response and the result is much, much easier on my hearing than the stock HD 800 sound. All the piercing highs are gone and there is more bass, and so far I'm finding the overall sound of the EQ'd HD 800 to be a more enjoyably visceral experience in relation to the stock HD 800. I'm finding that I can still using the EQ'd HD 800 use to peer into the smallest details of recordings but I have no compulsion to do so. To me this leads to more listening enjoyment than with the stock HD 800. It doesn't sound treble centric like before; it now sounds more cohesive and very well-balanced. As I now listen to the instrumental rock of Pelican as I type this, I'm satisfied and not wanting for anything else sonically. It's all there.
I don't think I want to expose my ears to the levels of treble revealed by the stock HD 800 again. As revealing as it is, to me it seems to be create more pain/fatigue than I want to experience.