I think you’ve got a decent chance at BU in EDII; and if that happens, the rest are moot!
Personally, I wouldn’t see the point of paying more than twice as much for a UC over Pitt (especially with Honors) for premed. There’s no reason to believe that the quality of preparation for med school would be any different. Pre-med competition and med school admissions are rough for UC students. If you were gunning for a more distinctive program at a particular UC, I would understand; but there’s nothing more sparkly about Orgo at a UC vs Pitt; and Honors at Pitt could confer benefits that don’t exist at the UC’s. And Pitt has a great reputation for all things med-oriented.
Good luck! You’ve got a great option already nailed down with Pitt, so you’re in great shape no matter what. My gut says BU will come through but my gut has been wrong before so we’ll see!