I agree that UIUC and UMich are not safties for your major. And even if they were, you would not hear an EA decision until late January. Which is obviously too late to add any schools that have a late Dec/early Jan application deadline.
UIUC does have CS +Econ as a major with a slightly higher acceptance rate than just CS.
The Sweat Hogs were from NY like the OP himself, not the Bay Area. So perhaps New York Sweat?
I do wonder if this is a term people outside the Bay Area use to talk about the Bay Area that no one who actually lives in the Bay Area would ever say - like San Fran or Frisco.