Thanks to everyone for your replies. I'm not a commuter, but I do laps at Stone Mountain park for cardio health. I weight around 190 and my 30 mile ride gains 1600 feet, I am up on the pedals a lot. Maybe it's load. Or maybe it's a frame issue like nfmisso suggests, but I don't think this bike isn't worth the kind of professional treatment he recommends (machining a $400 frame?). I did install my last BB using a torque wrench to the spec on the package, we'll see how long it lasts, but if it doesn't hang on, I'll try a UN55 once (it doesn't cost that much more) and maybe start shopping for a better ride.

AndrewRStewart I tried to upload some pics but the forum is saying I'm not allowed to post URLs?

Again, thanks to everyone for being so welcoming, I certainly didn't expect a magic bullet fix and I've got some good info to think on.