Based on your write-up, it seems Kaiser is the clear winner. Even without considering the unique opportunities that may come from being in the inaugural KP class, given your interests/goals it doesn't seem there is significantly greater value in the other two options to justify the difference in cost. Perhaps best to wait on financial packages from Michigan or WashU (heard they give great scholarships!), but based on your write up (support network, patient population, desire to remain in CA) it seems KP would be a better fit regardless.
I'm facing a related decision involving Kaiser with full CoA, it might be helpful to check out my earlier thread and read others' responses who are also in the same boat.
I was a little underwhelmed by Pasadena, but I really enjoyed its proximity to the mountains. That being said, I think it certainly beats Ann Arbor or St. Louis.