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In my experience NS wasn’t that deflated in comparison to Kaplan. So I would take that 511 as a ~511 on the real thing. In a few months it’s hard to predict the progress, it depends on your study skills. I would say you have a good chance though.
 
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Anyone else have experience with NS?
My hunch is that NS loses much of its predictive value beyond a 508. A 510 average could mean a 509 or a 521. The exams are more of a time crunch than the AAMC's and the questions are oftentimes more strangely phrased, so this wouldn't surprise me.

Focus on evaluating your content knowledge and problem solving skills over fixating on the score.