exactly what skalinder said...try to keep your levels up, but not too high where they're solid red and peaking all the time. try to keep in the orange on the v3 and your recording should come out pretty good.
also make sure you're running your mics in a proper configuration and try to get your stand inbetween the PA speakers just a smidge in front of the soundboard if you can.
that should hook you up with a pretty solid tape.