I am full of ideas (and other stuff related to Angus') so take this for what its worth.  I remember a few years ago there was a story of a bear attacking people's coolers (can't remember where this was) but was specifically targeting coolers with beer.  I have thought since then that beer would be a good thing to pour on a bait station.  Maybe a 6 pack of some cheap stuff.  Maybe even a beer burn would work.  Just thinking with my fingers here.