Too much power?

I find the ideal volume depends on your whole system. But in general, the better my system has gotten, the less volume is needed. 
 

Over the decades I have pursued this hobby, more power has increased the punch and fullness in solid state amps. Although, for less power tube amps bested them overall.
 

Looking over your system, if I were you I would look to upgrade my preamp before looking to increase the power of your amps. I would guess that a really good audiophile preamp would increase details and midrange bloom and have a huge improvement on the overall performance of your system. I would recommend the best used Audio Research, VAC, Conrad Johnson or Presto preamp you can afford. Then you can revisit the amp issue later.

OP,

It seems you are investigating the right things. I have had season tickets to the Oregon Symphony for ten years, 7th row center. Over this time the softest music slowly rises out of a black background and crescendos we’re a bit to much for my ears… where resolution is reduced because it is simply too loud… but we are talking about a couple seconds over many hours of concerts.

So, for me, this showed the audio levels that are appropriate. Only the very loudest crescendos being really loud and the very softest pieces coming out of the void. This gives you a base line of what a system should sound like. You want a dead quiet background  < 30db in your listening room and have the quietest pieces gently rise from this background, then the largest crescendos push the limit of when your ears start loosing differentiation. 
 

A full symphony is the key to gauging the sound pressure levels.

Your equipment, well  that is another story. The better it is, the more it will mimic the real world.