Finally have my misfire woes resolved. Despite no CEL and multiple tries to give me the car back with "the problem solved" I had the Service Manager sit in my car and feel it for himself. They tried one more time to give it back, and I literally drove it out the driveway, and right back into the service area.
They finally aquiesced, and replaced the two remaining old injectors. Occam's Razor.
Still have the stumbling idle / hunting RPMs, but at this point, I'm just glad to have my car back.