Maybe the Dan Clark Aeon RT? It did fairly well in Amir's review here
will you be using EQ?
It's a price step down but the AKG K712 has decent bass (it surprised me as far as open-back dynamic headphones go) and clarity up top, with EQ it does very well.
I'm also interested to see if the 'technicality' has any meaning in the real world, I'm pretty sure Crinacle has a description for what he refers to as technicality on his website, I can't remember it though!
At first it's quite a difficult mindset to get into, especially if you designed the system/circuit but it is definitely worth doing (or in your case, finding an expert to do it).
I remember finding an issue with a relatively standard motor control cabinet circuit where we'd induce relay chatter...
The uni problems would include extra information as you've said, but not to the level of the real-world and it was fairly easy to see what was needed and what wasn't (especially if you'd been studying).
Regarding the testers, definitely worth a massive amount, I vividly remember when we...
Although, really, as @solderdude suggested earlier, if it is a similar model with some issues potentially rectified for a similar price to the original - if it weren't for it being Drop I'd imagine people would generally be favourable towards it.
No need to apologise!
I still think it'd be interesting to hear from somebody with the engineering know-how about how they would've changed the material (I'm guessing only at certain diameters) around the driver for specific frequencies.