I’ve had a Diablo 300 for a year and sold it because it was too bright and too lean sounding.
It took you (more than) a year to realize this?
I now have a Vitus SIA-025 Mk2 class A, this is in a different league so much more musical and liquid sounding.
If you really want to try a top class Integrated amp, you should try T+A PA 3100 HV. Since you are in Europe, you should get favorable pricing