I would say that your stats, obviously, are very near perfect, and that’s a good sign. However, nothing really sticks out to me with what you’ve listed here. It may show through in your essays, but otherwise I’m sort of left with the impression that you don’t have a specific interest that you’ve pursued. Maybe work that into the supplemental essays that Brown asks for? That may give you a better shot. Did you apply ED?
Would you mind taking a look at my thread? I’m also applying to Brown, as well as some other schools. http://talk.collegeconfidential.com/what-my-chances/1830636-180-days-to-go-so-help-me-stay-sane-by-predicting-my-chances.html