You ... you haven't changed the pads (which look porous) in 7 years?
They are really cheap & (usually) easy to replace. And you can try different configs (what surface material suits you, thickness which affects sound stage, hard/soft/memory foam, gel, etc).
I've heard from people whose opinions I respect that they are like this with Koss (use em until they break after a bunch of years, buy the same to replace the old ones).
I cannot recall the exact model anymore. After I lost the second pair, I was in a spot where I didn't really need headphones anymore, so I can't check.