I find bass quite satisfactory, it’s a bit muddy in some parts but wouldn’t want more. For me the bass is the best part of them, just the right amount. I just cannot understand the dip in the frequency response in the vocals range and have no idea how to bring them out. The treble seems pretty straightforward to dampen. Oh, thanks for the tips!! Will have some fun with those. Converting them into open cans seems tempting, would definitely give them more soundstage which they lack. But I am not sure how drastic a change in sound it would be, probably will be the last mod to try out

Edit: now that I think about it maybe there is a happy medium that wouldn’t boost too much bass and bring out the lower mids