I read on TLS that it is best to send two. I think it was a harvard law school admissions officer (or the head of harvard law school admissions) who said that.
I'll just put it at this, I'm PRAYING for low 160's. My grades from undergrad are better than most, and I've no ambitions of attending Harvard or Yale, which I'd have had to have scored close to perfect to do any way.
PT Avg: 175, PT range: 172-180
RC: -1~-2 (bad day: -3/-4)
LR: -0~-2 (bad day: -3/-4)
LG: -0~-1(bad day: -3/-6 when I completely bomb one of the games)
usually when I mess up it's my 6th section..
Check what the school that you are mainly interested in says about this. For example Harvard has clearly said that if you apply late you will get the decision later but your changes of getting in are the same.