4. It's way easier to sell a speaker with a nice story behind it, full of praise and adjectives, rather than with it's performance data.
First is less expensive and easier to do, second is more expensive and harder to achieve.
Check this out, seems quite fitting for your needs:
https://www.audiosciencereview.com/forum/index.php?threads/dan-clark-audio-aeon-rt-review-closed-headphone.19393/
Edit: Although, you might have to get more powerful amplifier, since they need some serious power for even 94dB.
You might consider Dynaudio BM5 MKIII as well. I know these YT comparison's are mostly worthless, but since you have HS series model, it might give you some insight.