I'm one of Vitali's main collaborators, and I make the drum scans for him.
I can confirm a huge gap of "spatiality" between 8x10" and 11x14", it's not a banal problem of resolution. Massimo thinks the same.

You can see a lot of his works in 11x14" on my album:

http://www.flickr.com/photos/castorscan/6748095233/

http://www.flickr.com/photos/castorscan/