Sorry but your bike is set up completely wrong and a good example of wrong thinking on brakes. A long wheel base vehicle with a low center of gravity like yours will never be able to endo. You could actually lock the front wheel and slide it before you would be pitched over the bars. If you did lock the front wheel, your bike is less likely to crash as well (low center of gravity and small wheel). Your bike is more like a car in the physics of braking than a bicycle. All vehicles transfer weight to the front wheel. From bicycles to 80,000lb 18 wheelers.

Your bike you could actually brake up to the point where the front tire can no longer adhere to the road without pitching you over the bars. If you were to put the hub mounted disc on the front, you would see a vast improvement in your braking ability, especially with that huge rotor and metal pads.