when you say "I'm still interested in learning what the etiology of my particular "version" of IBS-C is - not as an intellectual exercise, but as a means of finding a treatment strategy that is effective", are you saying you think there is a specific cause and cure for IBS? Or do you think IBS can only be "mangaged"?
Are you following Jordan Rubin's diet by eating Ezekiel bread, taking his primal defense or Super Seed Fiber supplements, etc? His diet seems very IF based...was wondering how that approach was working for you.
I admire you not "accepting" this and trying to get to the basis of your problem! Isn't that a full time job though, I bet! I applaud you.