I am not a world class driver yet. But think of it. there is no reason for the rear of the car to have brakes. If you look at a 1:1 car, tge majority of the braking is done up front. And if you look at the physics behind it, more brakes on the rear creates out of control or spin conditions.

So with a spool, I would have the slowing down capabilities, and with the oneway in the rear, all wheels would be providing drive. I hate the idea of the diff. i can only assume that when the car is turning, the car loads the outside wheel. With more load on the outer wheel, the diff would tend to not drive that wheel. So exiting a corner, you would not be applying power down on all 4 wheels. With the oneway in the rear and a spool up front, power would be to all 4. I would think this would pull you around the turns faster.