As to amps and the Devore speakers:
John Devore said his goal in designing speakers was to make them as amplifier agnostic as possible. Which is why he keeps the impedance an easy load. He saw this as a competitive advantage in a marketplace where many speakers present difficult loads and might not show their best unless you used just the right amp. He wanted his speakers to shine with everything from lower powered tubes, to solid state.
This was especially true of the O series.
So the idea that you need just the right amp to make the Devore speaker shine doesn't make too much sense from the very way they are designed. And anecdotally, as I mentioned, I've heard the O series on a variety of amp topologies and they sounded excellent and similar on each.
I'm sure you can change the flavor to taste re SS vs tubes, but you shouldn't need any heroic search for "just the right amp pairing" to make them sound good.