I agree with
@xyphr here.
I'm not trying to give you a hard time, I'm just trying to show you that there is clearly something going on with your application that nobody's telling you, and it's NOT the MCAT. I was in the same position as you claim to be: ORM, strong GPA, lots of meaningful experiences, and interviewed well, but an MCAT below 30. I got five acceptances and got scholarships at more than one. It's not all about the MCAT. You're missing something in your application - maybe a LOR that makes you come off a little lackluster, maybe your essays or ECs aren't as good as you think/people are telling you.
Also, maybe talk to another school that rejected you besides OU. Oakland is notorious for selecting people who are a good fit for the "culture" there, so despite what would be a strong application for any other MD school they may have just felt your application didn't show the specific personality characteristics they were looking for.
And you already have a DO school acceptance? That's awesome! Beyond the money you spent on MD schools, who cares whether you get accepted to an MD school at this point? No matter what happens with your MD cycle you're going to be a doctor, and there are lots of people on this thread who can't say that yet. There's no reason to worry about it if you already have an acceptance at a school where you can succeed and ultimately end up with your dream career.