Older Audeze are notorious for having variations from one example to the next. That went on for many years until the more recent models, and I think they have it worked out by this point. But anything over a couple years old is likely to be pretty unique even compared to an "identical" headphone of the same type. It's luck of the draw whether you get one you like or not.
That said you can definitely try to find synergy with rolling tubes or opamps or cables etc, that might help fine tune things to your liking. But if not, it's probably time to switch headphones if that aspect bothers you too much.