If you have the DriveRack, why do you have external EQs and crossovers? The DriveRack is designed to replace those components.
If you are dedicating one stack to the dance floor, and the second stack to the listening area - just set up the DriveRack as a 2x4 system, using a L/R feed from the mixer. Pan everything to center so left/right get the same mix, and adjust your main left/right (if they are independently adjustable) to send a louder signal to the left for the dance floor, and the softer signal to the right for the listening area.
If the mains are not L/R independent, send the L/R from the board to the 2x4 DriveRack as described above, then lower the amp attenuators feeding the listening area stack.