Yes I know many will joke about this
but I found a very simple cure to add a lot more vacuum
Instead of spending a ton of money on a Aqua vac
i hooked up a three stage lamb tec in series with the #3 blower
Not only do I get more vacuum and drier carpets the electric motor runs at less amps by taking some of the load off the blower.
still need to run two cords
but much drier carpets for very little extra money. :