With stack height on shoes now regulated to prevent manufacturers from adding more cushioning foam to make faster shoes, there is actually a loophole around this rule by simply making shoes with WIDER carbon plates and foam. The advantage from increased stack height is because of the lessened peak forces from impacting with the ground because there is more height for softer foam to work with. But you can also simply make the bottom of a shoe wider along with the carbon plate as another means of spreading out the peak forces, something I haven't seen any shoe maker take advantage of yet. You would make the uppers and insole of the shoe normal but then maximize the bottom stack height to rules max and also widen the bottom of the forefoot foam to whatever you want short of making clown shoes.
The carbon plate in the Nike shoes are not anything about leverage but simply a fancy means of spreading out the forces from the forefoot over a wider area of soft foam to decrease peak forces.
