I have not read the complete thread but I am a regular on the Michigan thread. You have some great acceptances already. Paying $72,000/year vs going to your instate option like yes UNC to me doesn’t seem worth it. For pre med your at one of the best colleges already. I had $100,000 debt for med school and that was like 40 years ago. You want as little debt as possible for undergrad. Save the money now and put it towards med school. Keep something in mind. You need a high GPA for med school. Schools like Michigan are extremely challenging for even the best students but many find out medicine /engineering etc isn’t in their future the first semester to year so I guess that is a good thing. Pro hint : Save the money now and come back and thank us all later.
Good luck.