https://www.cir-usa.org/Images/mich_index.gif
Do you have any data suggesting that other universities give even remotely as much weight to underrepresented state as they do to race?
See here for UMich's 16 year old explanation of this scale:
https://diversity.umich.edu/admissions/archivedocs/uapolicy....
Do you have any data suggesting anything of the sort is still in use?
Unless public colleges are secretly flying in the face of a Supreme Court ruling, your assertion that "being black is worth +1.0 on GPA, whereas underrepresented state is +0.1 and underrepresented county in Michigan is +0.3," is unproven by the evidence you provided.
Had you said "was," and explained that you don't believe things have changed, that would have been far more intellectually honest.