The Gryphon sure has raw power, but found it to bright on some few songs, borderline fatiguing.
This is totally the opposite of what the sound is like, not just with the Diablo but the whole Gryphon range, if anything the sound signature of all Gryphon amps is on the darker side of neutral and always has been. And reviews back that up, not that that means anything.
Something was wrong somewhere if that was the case, and you came to that conclusion, of "borderline fatiguing", unless it was just giving what the recording was like, which is a good thing, as it’s not masking then and had better transparency of the two amps.
Cheers George