First off, congrats on your system, sir!
With that out of the way, please allow me to share my 50 centavos regarding power:
It's hard to appreciate without having experienced other amps, but the power is doing its job even at low volume. It's what's behind the quality of the bass you get.
Switch to a lower power amp and you'll feel the bass become boomy and muddled, conversely go to a higher powered amp and it gets tighter and cleaner.
Got to experienced this first hand when I upgraded my amp from a NAD C320 to a C372. Even using my budget Polk TSI300 speakers at the time, the improvement in bass was very drastic. I never knew what I was missing until I actually got the new amp, but it was a "I didn't know my speakers could sound this good" moment for me.