Update:

threads are fine. cups aren't cracked. My LBS told me that the cause could've been that one of the cages was bent, so that could have been the problem. I got rid of the old bearing cages and replaced the old bearings with new bearings greased up real good. tightened until my hands turned red, went on a 10 mile ride and my **** was wobbling again. So either my fat ass is too much for my BB, or it's too cheap to handle my "aggressive" riding. I'm going to try loctite tonight before I throw it in the alley.