I hate to say this, but...you should've done usmle world instead of Kaplan and you should have done all the NBMEs as well. Its ridiculous that people come on this board and complain about how they did poorly after they don't follow the almost universal consensus on this board about how to do well (i.e. world is more like the real thing and is the best qbank, nbmes will reappear on the test and are thus freebies).
This whole rescoring business won't change anything, its a computerized test not a scantron that has a theoretical chance of getting misgraded. Do you really think the algorithm was screwed up? Otherwise, the NBME would be in such deep slit since the whole batch of scores would be completely off. Your only chance is if you remember some egregious questions that may have been graded incorrectly, but after such a time period it will be difficult to even remember more than a question or two that was just that off the wall. Even if do find questions to challenge, it is likely going to be an experimental question that wasn't counted anyway.
Just face the fact that you got arrogant off the results of one NBME and didn't work as hard as you should have.
FWIW, all my friends and myself got scores near pre-test predictions or significantly (i.e. >6 pts, the SEM espoused by the NBME) higher.