Honestly, Mark, I don't recall any significant difference between full tang and short, pressure fit tangs when making a good cut. Bad cuts (and there were plenty) felt horrible regardless of sword construction, but I wasn't paying particular attention to vibration differences.
I haven't cut with my dha for over a year--time to break them out again. My Muay Thai training partners have been pressuring me to bring some to the gym anyway.
When I get some time, I'll cut with a variety of different swords and will report back to you with my exceedingly unscientific observations of vibration.
