The only thing I would like to contribute to this discussion is the mentioning of 4 ounces deflecting a thousand pounds.
Now how you apply this is very much to do with what you are trying to achieve, and the tools and method you choose to achieve it.
If you use a spiraling technique on contact with the opponents body to disperse their force and gain a superior position from which to counter with a strike then this is one way. If you use plain structure and "circle walk" your way into a superior position, then that is another. If intercepting and leading are your method then here is yet another way. They all rely on the sensitivity to use the 4 ounce rule to be able to pull them off.
Whether working heavy or light, for me falling back on the base point of 4 ounces is crucial to using anything I've learnt in IMA.
Although I favour more of a Bagua flavor for wrestling encounters these days, I have spent a considerable amount of time on (techniques from tai chi) neutralizing grips at a certain distance (trapping range) that serves well as a kind of anti chi-na. If an opponant's attack can be maintained At this distance and any advance intercepted it works well for me. If the opponent gets past this line of defense I face a different set of problems.
Where I am going now with my approach to wrestling is to explore more deeply the change over point between these distances and the type of "energy" I use. For example at the trapping range I mentioned I will rely more of an expansive
centrfugal peng approach to dealing with attacks. However when the opponent has closed to a clinch I am attempting an absorb/neutralize/takedown-throw by switching to a more centripetal contracting approach augmented with walking for the change of angle. Effectively pulling the opponent into a downward spiral.
Well that's my 2c worth