For what it's worth, I have Vandy 3A sigs. and was also frustrated that I wasn't getting the quality of bass that I heard when I paid a visit to Richard Hardesty. Thinking that the difference was the 2wq's that he used I bought a pair. Helped a little but, still not even close to what I heard at his house. Then I visited a new friends house who had a older pair of Vandy 2's. His bass was much tighter and musical than mine. That was when I realized how important the room was. I toyed with the idea of treating my room as discribed at Mr. Hardesty's website. Especially after seeing it first hand.
After reading all that I could find I went with a commercial product instead (Realtraps). I know we have all heard it before but, let me be the next one to say it, it was like buying new speakers. It is hard to beleive all the hype about the room being as important as any other peice of gear but, unfortunatly it is true. Treating a room isn't as sexy and exciting as getting a new peice of audio gear but, it can make a more positve contribution to your system than most other upgrades.