Here is my tip for wiring the drivers.
At the amp end, wire both set of drivers as if the are both front firing. This means the drivers are in parallel red to red, black to black. Wire the servo wires in series with one red and black wires from the pair connected together.
Wire the forward pairs as normal. Wire the reverse pair with all the wires colors swapped. When you get to wire 12 of them, you look for a simple visual method and it works.
Give that a try if needed.