It definitely sounds like your heart is with Pitt, and for the right reasons.
I remember being turned off at my Mayo AZ interview as well...not just by the tiny class size, but how they talked themselves up during the tour and other presentations. "Mayo brothers this, mayo brothers that, three shields"...it all sounded very culty to me and not as welcoming as I would've liked it to be. Additionally, the reputation they tout is not nearly as prestigious/well-known as they MN campus (as evidenced by my convos with some residency program directors). Also, I was not a fan of the tiny building that was intended to house the whole medical school. Really felt pretty isolated/trapped.