Ok, I see!
I don’t know many closed headphones, although one pair i used to own was a Sony too. It wasn’t the 7510. I don’t remember the model (edit: MDRV500DJ), but they were unforgiving in the bass, too much of it and they would distort instantly, or throw mud at me, which I think is a good thing when referencing.
I’m using cheap Samson SR850 at the moment and looking at other open cans that aren’t as hyped in the high mids/treble, so I don’t have to apply corrective EQ when I use them (they are nicely flat apart from that psychoacoustic spike present in so many models). Let me know if you have any recommendations.