My hypothesis on Forefoot running is that the causation is reverse. In that it is not good running form that causes people to run fast, but running fast causes good running form. For example if I go out right now and jog a 8 min pace I will land heel first. However, if I go out and do strides, intervals, hill repeats, or a tempo run I will land more Forefoot/midfoot.
So my conclusion is, not to worry about where your foot lands. But, to focus on being relax and smooth when running.