I threw in two gallons of hi-test just to make sure I had enough fuel in the tank, the pump seemed to be pushing out plenty of fuel. Put it all together and rode it for a few miles, the fuel pump screech is significantly reduced. Actually sounds more or less normal now. Still audible while riding at very slow speeds, but barely. That 'first ride', though, brought up a bunch of new questions - I'll post them in a new thread.
Thanks for the advice though, it really helped!!!