The BAT solid state amps deliver lots of current, so that handles your load requirement, and are biased heavily into Class A. As such, they run hot, but I've owned BAT pre/power for the last seven years with no desire to make a change. Don't know them with the Utopias, but my Magneplanars are 4 ohms nominal, and there's never an issue of drive or control.
Which amp matches best my JM Lab Mezzo Utopia ?
I have clearly a predisposition to single ended and Class A design. Push pull does not apply. The speakers are a demanding load though. They go down to 3.8 ohms.