Much mahalo for all the great advice. I called Baer Brakes today, and they're going to "look into it." I also learned that a rear brake system for the Pantera isn't gonna happen any time soon. My guess is it might be done by the time I'm using a walker, or that they've scrapped that project altogether.
I spoke with Scott at SACC yesterday, and he laid out what was happening with my current system, logically explained the physics, and how it an be corrected. Now, I'm looking into adding a set of 4-pot Wilwoods to the rear -- it's just a matter of being sure the piston sizes match front-to-rear (Baer to Wilwood). I wish I had done some more research (as does my wife
