I don't particularly have any experiance with the VS speakers you speak of; but I did have major bass problems with the speakers I have now interacting with my room.
I am not sure what you mean by damping. I am assuming you mean damping the room? Or did you stick something in the ports on the speaker?
If it is room damping, I would look into perhaps changing where you currently have your panels placed. I have added a significant amount of acoustic panels and bass panels to my room, and have never noticed any "timing" issue.
I have however been able to tame massive peaks in bass response, and control reflection issues.
Also take a look at where you have your speakers placed in conjunction to walls and corners. Placement can augment problems in response.
These are just general rules of thumb to see if anything helps.
Congrats on the VSAs; love em.