I really have no business posting here, as I was accepted and began my PhD training this fall. I randomly thought to check the site again and see if the same kinds of existential angst were circulating once again.
You are applying to awesome programs! I applied to those 4 programs and was accepted at each, so I know full well that you cannot go wrong with any of them. However, I would disagree with your advisor. It is true that Tufts now has Kareem Khubchandani, an awesome addition to their faculty that will provide students with someone who can teach and facilitate work in the field of performance studies. However, after speaking with both Heather Nathans and Laurence Senelick, I walked away with the impression that Tufts was a top notch program, but still firmly invested in the study of theatre history. There is absolutely nothing wrong with that; I think its absolutely badass. I just wouldn't operate under the assumption that you would be able to get the kind of exposure to Performance studies that, say, Northwestern or Berkeley might offer. If you have any questions about those programs, please feel free to hit me up.
Also, if anyone is applying to Master's programs, check out the A.M. in Theatre and Performance Studies from Washington University in St. Louis. Great school. Even better faculty. Wonderful interdisciplinary community. Just a fabulously supportive environment in general. A master's degree from this institution, along with the letters of rec that come with it, will land you in the best PhD programs in the country. Myself and the two other members of my cohort whom applied to PhD programs were all accepted and admitted (the three of us are now at Stanford, Northwestern, and Minnesota). Check it out!