http://www.lammindustries.com/PRODUCTS/M12descr.html
Lamm actually posts correctly what goes on in amp specs a rare finding
There is no SS class A amp all are class A only to a point and class A/B after
The amount of watts we need is not truly depicted in specs and must be voiced to your speakers , room , listening volume
A good guess is your amps currently clip but you’re used to it.
Class ratings are good in that you know where the amp is biased where class A is sweet but lacks jump class A/B jumps
All amps go into class A/B at some point and playing your music gives you details where.
The fact that Lamm adjusts the bias for low z loads is a clue to the needs amps must be changed to meet the needs , it does not mean it can be all you need though.
Google clipping and how to hear it this yields what you need in looking at a bigger amp as well.
Playing lower helps where the amp clips and keeps the amp in class A longer but dynamics are far more at play then an amps wattage ratings will show.
As for the sound of bigger amps over smaller that is complex and again should be heard in your setup.
One thing you may try is borough an older Krell FPG series one that has had the caps replaced
450 or even better a 650
The sound of it is not just what your listening for , it’s also control
Control yields clean dynamics that have the tiny details that are lost as an amp goes twards clipping way before it acatually clips.
I used a few amps in my setup before I broke down to buy what i have.
In getting there an audio bud helped me mod an amp I had
The results were striking to say the least it’s how I learned of what i posted above
While I get the theory of amps learning what to listen for is complex and at some point I had to admit to my amps short comings. Most will get insulted with my post but in truth it’s not meant to be so. I was you guys and still am but when someone opens a door that we see it becomes obvious we have our own prejudices that keep us where we are. Once we remove them by admission we then can move onto better sound that does not yield false dynamics or shouting.