I have a lot of expirience with accuton .
You already gave the answer , a paper /composite mid sounds maybe a litle more friendly ,relaxing and less detailed sounding .
But my expiriece is at least with my own designs that the ceramic in the tweeter is the main suspect.
A combo with diamond tweeter is hard to beat , and yes maybe one has to adjust to clean high res. sound.
The accuton with the black ears is a very nice made unit with a powerfull neodymium magnetdrive , this high efficiency model makes the design more appropriate for tube designs .
I found a nice paper composite mid and gonna make a model around it for comparison in the future