As you are using Look brand snap-in cleats, I imagine you know that a skilled cyclist moves his/her feet in a full circle, providing force throughout the entire rotation. As a cyclist with decades of experience, I can tell you that the ability to use more of the different muscle groups within my leg to push forward, down, pull backward, then up allowed me to transfer far more energy into the forward motion of my bicycle per minute than would ever be possible by only pushing down, or even pushing down and then pulling back up. In addition, you legs are only efficient through a certain range of motion. If you bend your knee past a certain degree, then straightening it requires much more muscle energy and puts your knee joint under much more stress. Thus, the length of regular crank arms are (or should be) calculated based upon the length of the rider's legs.
All you really seem to be doing is adding a gear multiplier and long levers. But it doesn't really increase true efficiency of the rider or ability to transfer energy into forward motion. It is more like just using an uncomfortably, and inefficiently long crank arm and then starting in a really high gear.