By themselves, SET amps will never satisfy loud, bass-heavy music. In order to have a do-it-all SET amp, it has to be relieved of bass duties. The Horning speakers come to mind, and my Definition Pros fit the bill. Keeping 45 SET tubes to 65 hz and above, I can play Tool Very Loudly without compression or undue distortion.
So, it can be done, but it has to be a conscious decision and you have to like the speakers which some people don't. These speakers tend to sound lit-up in the presence band, though that can be very successfully addressed with equalization like a TacT unit, which also can handle crossover duties. I don't really care for the DACs though, so a suitable outboard unit then becomes necessary . . .
In some ways, this is an anathema to the SET ideal of simplicity. However, the final result is its own champion.