yeah, I think you need to take this site and TLS with a dose of salt. I really enjoy the people here and the community and there is a lot of solid advice for law school admissions and practice questions. I also think, as many others have said before me, that explaining to people how to solve a LR, LG, or RC questions helps you understand the questions better. That said, as I just said in another thread, people tend to be bombastic about these things. They say, it's just numbers, you have a low GPA, you can overcome that with a high LSAT, etc. etc. That is probably true 90% of the time. But from my own understanding and whatever I gain gleam from LSN, a lot of other things can come into play. You have your PS, LOR, addendum's, LOCI to explain yourself further and I have seen people who are below the median, get into their schools because of their supporting documents. Of course, this isn't the norm. Rankings do matter, but don't think your life is over if you don't do well.
What if you get 10 points below your average? Well, that's life. You suck it up and move on. That happened to me and yeah I spent a week moping around about it (in addition, I had just lost a family member who I was extremely close to). But that happens in life, not just the LSAT, and the people who succeed are the people who can pull themselves together and move on. Like you said, most schools accept the higher score, and as long as you compelling addendum you should be fine.
Don't freak out about something that is 2 1/2 months away. Don't let that irrational fear enter your mind. Put it to the side and work, work, work. This is what makes results. Early on I imagine you realized you had an affinity for math and science and testing, and that made you feel confident about standardized testing. You have a natural affinity for standardized testing so I would say, to start with you're already ahead of most people taking the test. Calm down, sign up, and get to work.