Sure. Peaks would definitely draw more. Some music may require 18dB peaks which would mean 32W with a half watt nominal. So even if you listen at nominal levels of 1 W/channel, 18dB peaks would require 64W. That still leaves you ample room with a 90W/channel amp.
If you know the speaker SPL at a specified distance with a specified power, you can estimate the SPL at any distance and any power. The M22 for example has a sensitivity of 89dB/W/3 feet. At 9 feet, the SPL is 83dB. Two M22s would give rise to 86dB. Since you are reporting 75dB, most likely your amp is sourcing less than 1 Watt. I say most likely because there are room effects too.
I've measured the power into my M80s at 50Hz and I also know exactly where my Denon starts to distort and where it starts to square-wave. Look for my post titled something to the effect of power into my M80s from my cheap Denon. I've figured that I listen to music at about a half watt nominal and movies at a few watts.
