Hey Keith,

If you notice in PB's video's, he's entering in range and pushing his partners away bit, this is a way to express power without having to hit. Like you say, no one in the vid is training to go in for the Kill, that is the problem right there. Wing Chun sucks in light sparring as we HAVE to go in for the KILL as this is where we function from, when you continually stop your power and mechanics from expressing by holding back and back stopping it your only hurting yourself, which is why we do slight pushes and expressions of exploding power when we play around, it helps us in applying it later on

J