My first reaction, from a strictly mechanical perspective, is that all this extra power could be wasted if the wheels break traction before maximum torque is reached. From a durability standpoint, I'm concerned that the vertical hex shaft may flex under load, causing stripping of the miter gears. Consider a mechanical support for the free end of the hex shaft, or use a worm/worm gear arrangement, like in the AM Raw Box.
BTW, we had great fun at Peachtree with you guys!
