Ken:
I think you place far too much faith in science, rationalism and its methodology (its my opinion of your take and we all know what opinions are like!).
Again, science has not "proven" in any sense, what the placebo effect is. Yet it is used as explanation for that which has not been explained. It's a catch-all with the faith that science will some day explain it.
I won't repeat my post, but there are many facets to the methodology (not method) of science. Qi doesn't have to be proven: it's framework only has to yield testable hypotheses that can be empirically validated.
I guess we don't read the literature the same way. Acupuncture which uses meridians and the concept of Qi as its framework, is emprically validated. Validation is not an either/or measurement . Validation is always a degree, a statistical degree and its acceptability threshold is arbitrarily chosen. Whether you accept a correlation coefficienct of .2 or .9 as evidence of validation is based on the subjective judgement of so-called experts, i.e. scientists. This also assumes a statistical normal distribution (which cannot be proved but only asserted).
There are also many rigid self-anointed saviours like Randi who believe it is their mission in life to save people from their own subjectivity. No different than the born-again saviours of Christ or most Western religions or Muslims for that matter. For many, "Science" and its proof has become the new religion of skeptics who refuse to accept the uncertainty and mystery of human existence. I guess we all chose our poison and go on.
The End of Science, (written by a former editor of the Scientific American, New York Times review. My copy is out) really lays out the idea that we have reached the limits of what science can explain for us. With that in mind, I guess all we can do is go on living life and enjoying the subjective experience much as what you are doing with Chen Xiao Wang.
But I have to be honest, when I started in baji/Chen's taiji and even the most "mystical" art of the East, ba gua, qi was seldom discussed and more attention was focused on alignment. The sensation of warm hands and back etc. associated with Qi is also associated with bloodflow and when I taught taiji through our continuing education, I always used a blood flow explanation for the sensations felt in taiji.
I always reserve a bit of skepticism too, especially when a taiji player tells me they can read my aura. There are limits!