I'm a non-URM with a 4.0 and a 172. PT average about the same with a few (recent) scores between 174 and 177. Is it worth taking again in November? My top choices are Michigan and Northwestern.
Not really. Not for Northwestern. Especially with OP's GPA a 161 wont do it. Even a 168 would be tough to get in/much more than just sticker.
http://mylsn.info/ej6090/
http://mylsn.info/sar7yl/
... would highly retake if Northwestern is your goal. You ... statement and situation where Northwestern would make an exception ... into your acceptance from Northwestern, especially considering how formulaic ... even considered before where Northwestern becomes a safety ...
Unfortunately, I know Northwestern won't happen this year... I missed their application deadline. It was before the February release and I didn't want to waste the money applying without knowing my raw numbers would at least get my application a glance.