I would look upstream. Your NAD is a decent amp.
What is your preamp and source and cables?
Audionoobie's Belles Aria is a great combo with Vandy's. I run a pair of Aria monoblocks with my VLR's. They really put my old McCormack Micro amps to shame.
Also, preamp and cabling will make a significant difference in what you are hearing.
Please, don't think I want you to buy more equipment, but my opinion is that if you aren't hearing complex passages, then there must be something wrong upstream, because I know the Vandy 1's can perform as well as the 2's with regard to complex music. The only other factor would be if the speakers are in need of repair.
Bob