This highlights the whole problem of making a rock solid stable class A solid state amp of over 100 watts.
I will say it again, if you want a bullet proof class A amp without all the problems, and their are big problems with the pass approach, then buy a Quad 909. Although the output triples are biased class AB, the performance is determined by the low power class A amp, in Peter Walker's brilliant feed forward design. No one has ever poked holes in Peter's math, nor his results and measurements of these wonderful amps. There is absolutely zero crossover distortion, with no error at all at the zero crossing. So they are truly class A performance. I can personally vouch for that.
For people using separates in superior systems, a Quad 909 should be a no brainer at least for the mains.
I have used them for going on forty years now and would never part with my "current dumpers".