Still have no idea how people get along with stock sound
I'm fine with HD800 stock sound but it needed a lot of time and efforts on the gear to get used to it . Remember I almost don't listen to rock/metal/pop . That helps.
I even tried to let go the HD800 during a month . During this month I listened mostly a Stax SR404 and it took maybe half an hour fo my brain to adjust when the HD800 came back. If I listened to a HD650 during the same period, it would probably have taken more than half an hour...
I currently run my HD800 without the Dust covers and with some thin rugliner. The change is not huge but I think the rugliner helps.