Focal sopra 2/Gryphon Diablo 300 not good match

How is your room? Do you have any room treatments?

What DAC you’re using with your N10. I also own N10 paired with EMM Labs DA2 and I can tell you it’s not N10. As others have pointed out Diablo is far from bright, in fact quite the opposite.

Moving to a warmer but very detailed amp or pair of amps might help.  I will admit, I didn’t by Focals before I started my company because I found them bright even driven by MC275s.

Are you in the US?  If you want to keep the amp you could move to a more neutral but detailed speaker like Raidho.  

I think that this speaker uses a Beryllium tweeter. I have heard tweeters of this type sound good, but this is not a material I would favor and usually dont like tweeters of this type. Experiment with speaker placement and tame your first reflection points to see if this helps. An acoustically bright environment with this speaker could be your problem. Wish I knew more about your cable. I dont think the Gryphon is your problem although tubes would probably help this situation. As Erik suggested, dont toe the speakers in one bit.

@joannism
For what it’s worth I attempted toe-in (and moving to other area of house to try in different acoustic environment) and nothing would shake the intensity in the upper midrange/ lower treble (aka "presence region");
I did not put thin cotton ring around the tweeter, though, a trick I have done before that works wonders for smoothing out response in this area;

In the end I sold them chalking it up to bad synergy and the fact that we all hear differently; I moved "back" to the smoothest sweetest most refined tweeter/ presence region  i’ve ever heard: Dynaudio.
Good Luck to you sir!