Plink, that's a good idea. Keep the M22s on the monoblocks for a week or so -- making sure to play them loud at times. Then put them back on the NAD and see if you notice any difference. If you do, it's most likely to be evident during moments of big bass or high transients (softness to sudden loudness). The monoblocks will be able to provide more instantaneous current than the NAD.

It'll be a close call whether you can actually hear the difference, but peace of mind counts for something.