It doesn’t hurt to have more power, but to me it’s more important to have good power that sounds good. A good pure tube set up should sound wonderful with your Sonus Fabers. You have the resolution potential to hear the wonders of a pure tube setup. I would not compromise with a hybrid, because that’s what you’ll hear in the end.
Yes, this is my train of thought. Seek out the beauty, emotional engagement and naturalness of pure tube power.
Afterall these years I’ve learned that I trust your ears and judgement. I have no doubt that Synthesis Roma amplifier sounds wonderful. I have more familiarity with Unison Research amplifiers. Italy is the home of some really fine sounding tube amplifiers along the natural sound side of the spectrum. Very good options are available for the OP.
Charles