I don't know that switching to the Hsu sub will make that much of an impact. You might want to take a look at some of
Ikka's tests to see if there is something that might lead you to think that you might get enough extra oomph to get the bass you're looking for.
My suspicion is that you'll have to move up the food chain further in the SVS or Hsu line up before you get to the bass levels you're looking for.. unless you build your own.
JCD