Hi, the Virtue amps (including the Two.2) are not like most Tripath implementations, they are configured to be able to drive double the current.
The result is that the Two.2 effortlessly powers my 3.3 Ohm speakers, especially when used with a 24V/10 Amp battery supply. Tremendous output and hard to get it to clip before the ears start bleeding.
However, same amp w 24V supply into 8 ohms doesn't have nearly the same output level before it runs into clipping. It's a little better with a 30V supply, but it just doesn't have the same drive and grunt as into 4 Ohms.
Subjectively, I think the Two.2 actually sounds better into lower loads, pretty much across the board. YMMV, but I'm betting you'd be happier with the 4 Ohm load.