Wing Chun vs. Northern Mantis

On the heels of my post suggesting that some Wing Chun guys appear to carry their center fairly high in body structure, I found this training fight. These guys are pretty evenly matched, and while this sparring session appears to go by tournament rules (no elbows, knees, kicks to the legs), it's still pretty good. The Mantis guy carries his center low, testing my theory, but the Wing Chun guy consistantly maintains positional superiority. The grappling clinches could be cleaner but they do occur, reminding us that while hitting closes the gap - grappling is inevitable. It does seem to me that there is a lot of energy wasted on high kicks, and some of the hallmarks of Wing Chun we have viewed in past posts (such as trapping skills) are not present.
Martial Development sent me a note to check out "Why Wing Chun punches never miss", which outlines some of his Wing Chun strategy, with some ideas about chain punching, positioning and timing.
As always, I appreciate everyone's input. While we have incorporated Chi Sao into our push-hands play, my working knowledge of Wing Chun is somewhat limited, so thanks for the tips!