Focal sopra 2/Gryphon Diablo 300 not good match

I'm with dpac996.  I have an older speaker presently in my system.  Mirage M3Si.  I have been building my new system for about 1 1/2 years and speakers are the last big category to replace.  The Mirage uses a metal tweeter, made of titanium.  Berylium is the common metal used now in place of titanium (like I said, mine are old speakers).  I absolutely did not want to move into a Focal speaker due to them using a metal tweeter.  I have always found Dynaudio speakers to sound just right in the midrange and the high frequencies.  And thus, my decision was made and now have a pair on order for the new Dynaudio Contour 60i.  They are due to arrive in the US during August.  Well anyway, that's my story.  The bottom line is that metal tweeters, especially if the room has a reflection issue, can be rather bright.  However, you described a very well treated listening environment.  I can only believe, therefore, that the metal tweeter is just not the right product for your listening taste.  As others have stated, we have all made mistakes or error in judgement.  We try, but ultimately move out of the product and make a change.  The pursuit goes on.  I wish you the best in finding and settling on what pleases you the most.

I had the exact same system you have.  Diablo 300 with N10 and Sopra 3s.   I did find it to be a bit edgy and intense with certain music but not like you are describing.   I had wireworld eclipse 7 and never used silver cables.   
I have EVO Scala’s with Octave gear now and absolutely love it.

I agree with others you may want to try tubes or class A amps.   Maybe change up the DAC as well.

While I am not sure that I agree with d2girls that we necessarily want to strive for a flat sound signature, I do think he/she makes an excellent recommendation that you may want to buy an eq.  In fact, the Schitt Loki is only $150 and users here give excellent reviews noting no degradation in sound from the unit.

D2girls; my confidence 30 and 50 measure very flat; Dynaudio designed these in their mega expensive Jupiter Lab; they are like a precision instrument that does not emphasize any particular frequency, so I’ll have to disagree with you; Some speakers are just voiced one way or another with actual program material however; Trust me; if the recording is live and well balanced the Dyns will portray that about as perfectly as possible. There is no roll off in the tweeter; 
I would be willing to bet most folks prefer a sound that emotionally connects them to the music, which by definition is the embodiment of emotion; our ears are not microphones and our brains are not oscilloscopes; I think Nelson Pass said that and I happen to agree; Cheers all and enjoy the music!!