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When I am taking my practice tests I often come across questions (in LR sections, specifically) where I am certain that 3 of the answers are wrong, but am unable to clearly distinguish between the other two. For time's sake I usually put the answer that seems best and move on. Somehow, at a percentage that seems mathematically impossible for a 50/50 scenario, I miss almost every one of these questions. Is there any tricks, or specific things to look for in order determine the better of two decent answers?
I was in a similar situation this June. I found 7sage about two weeks before the test and I was scoring around 160-165. An act of fate (a misspelling on my admission ticket) prevented me from taking the test in June, and I believe it is the best thing that could have happened. With the extra time I enrolled in a 7sage course and bumped my scores up to the 172-175 range. So I would say the extra time would definitely help your score.
However, it comes down to, in my opinion, whether you're willing to accept a score in the range you have been getting. If a 160-166 gets you in your target schools then taking the test next week would be smart to, as you mentioned, take advantage of rolling admissions.