Well, cleaning out the BSA threads and the crank/chainring interface fixed all the cracky-creakyness. Just goes to show BSA is no silver bullet.Well I may have destroyed the frame in the process. Crank bolt was jammed on there, so I got a big breaker bar socket wrench, but as I went to try and turn it, the allen in the socket somehow fell out and into the BB. WTF? So I have to go and get a backup long allen wrench of the same type, but even with a breaker bar extender (pipe) I can't get it to budge. Try hitting it with a soft mallet, that does nothing. Can't find my metal mallet, but I find my hatchet, so hit the backside of the hatchet against the allen, trying to break it loose. Just as I finally get it to break loose, for two blows, somehow, even though I'm trying to be careful not to do this, it rebounds against the frame, like the santa-cruz test videos, but it doesn't look nice like those, two hits, one may have some delamination. F*ck. So I sand away the clear coat, put some epoxy on there, wrap it with some stretchy tape to help press the epoxy in there. The only not-so-bad part is this is a cheap chinese frame that cost around 400-500 in the first place, so not that big of a loss, but F, this went bad quickly. BB bearings appeared smooth too. Threaded BB interface seemed a bit crunchy.