MN is anchored by a larger metro area than WI and IA, whereas MI had more non-college educated voters.
Trump did better among the college graduates demographic than among those with high school or less in Michigan, so not sure what you're talking about.
That is true if you do not include those with a post graduate degree as part of the college graduate demographic.....
Overall Clinton won by 6 among college graduates in Michigan and lost by 4 with those who didn't graduate college. Among whites with and without a college degree, the gap was wider.