Oooo-K. Took it apart; cleaned; re-greased; re-assembled. Still wobbles!
I see the problem though- it's not how the crank attaches the BB spindle; it's the insert in the carbon crank- i.e. the connection between the crank arm and the metal insert which screws into the BB!!!! I suppose I'm screwed?
I'm gonna go ride...when I get back, I'll do a little research and see if this is a common problem with FSA SL-K Lights.......