You will also have to wire those additional posts to independant circuits inside the speaker. This may or may not be easy/possible to do depending on the crossover design. Why bother?
I have the Vr-series schweikerts. I run rogue 120 magnum tube amps. I wanted to see if i could get a better lowend so i bought a krell ksa200 and biamped. The levels were close suprisingly enough, to make a long story short the rogues lowend kicked the krells ass. Those Vr-3's are excellent, buy a better and more powerful amp and say the heck with biamp. You might want to hear a pair of rogue 120 monos on those. Have you taken the time to set the systems up correctly? Pink noise Ball?