I don't know if this will help you but I applied to Northwestern two years ago and got rejected. I wrote to Nathan Mead asking if I could get some insight into why my application was rejected or what I could do to make it better (in terms of profile, GRE scores, etc.) I was very inclined on reapplying back then. He replied very politely, telling me that the sheer number of applications makes it difficult for them to answer such questions.