In my opinion the AW score shouldn't kill your chances but I've seen some schools in my field (Computer Science) that have a cut off for AW, but I'm not sure for your field. In my opinion your writing sample and SOP should count for a lot more, but unfortunately I don't sit on any admissions committee If you don't feel comfortable with those scores, especially applying to top 15 schools, perhaps its worth doing over, if only to settle your nerves. You could also contact the schools you are applying to in order to find out if they have a cutoff.
EDIT: Just to clarify, the cutoffs I've seen are lower than your scores, so you would absolutely pass the minimum requirements that I've seen in my field and I suspect in your field. The question you need to ask yourself is if your application overall is strong enough to get into the schools you want to go to.