So I would already say the d8000 pro isn’t most likely up your alley, more intimate v shaped headphone, good all rounder and very detailed without fatigue but doesn’t sound like what you are looking for in terms of stage and midrange/naturalness.
I think the clear is pretty nice if you plan to use it for studio use, but I don’t know if that would be different enough and would be a step down capability wise from the stellia, so idk if it would really offer too much for what you are after.
The empyrean is a good all rounder with a warmer more pleasing sound, but generally imo for the price I think it’s lacking in technicalities and really isn’t as high of a performer as it should be, so personally that’s not something I would really recommend when they tend to sell for so much
You might really like a lcd 24 imo, that would check most of your boxes and is really worth a look, going to be wider, smoother, nice midrange with solid timbre, but also maintains the resolution and capabilities of a higher end headphone
I also think you should def check out a diana v2 imo, that would give you a very well rounded and refined experience, really complete sounding headphone, would be what I would suggest instead of the emperyan as I kinda think I prefer it on almost all fronts over the meze besides the bigger sense of largeness the meze has (but the meze doesn’t have as much stage depth or accurate placement)
For the zmf, I think you would want to look at a zmf auteur or verite closed imo, very organic sounding, the auteur has very natural timbre and good bass punch, the verite is lighter with more resolution to be had with a bit better stage depth (but both are average width wise imo). But for this can I think you might want to consider a nicer tube amp to go with them for your sonic goal.
Regarding the hifiman, I don’t know if any of them really sound super up your alley because of potential treble, but they are pretty wide and grand sounding, something like a he1000se would be nice, but I think with the amp you have it might get a bit bright, although I can’t say the midrange or naturalness is their strongest strength but they def have the stage you might be looking for and are good all rounders