well if you were just testing the frame material you would just need to see what material dampens vibrations better.
http://www.sheldonbrown.com/frame-materials.html
after reading this i have come to the conclusion that it comes down to geometry and not material, although some materials may help, it would not be substantial enough to change your mind. the geometry would more likely cause the "feel"
and yes, i am an arm chair engineer because i quit my Mechanical Engineering degree. But sheldon browns page makes alot of sense.