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At the last second while filling in the reading comp, I noticed that I was one bubble behind. I had been transferring my answers to the answer sheet from the book after every passage, and I thought I was being careful about it, so it may or may not just have been the answers for the final passage I screwed up. I honestly have no way of knowing though; I was so tired at that point. Should I cancel my score? I usually score between 165-170, but I was not feeling especially good about this test, despite having one of the easiest games sections I can remember. I'm just worried about there not being many spots left for me if I wait until after the Feb LSAT. Also I have almost run out of tests/problems to practice on.

I wouldn't cancel. I would see what score you end up with and register for the Feb test if you're not satisfied. It will be easy to explain this issue in an addendum, especially if you score better in Feb. And schools tend to focus on your top score, not an average.