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First off, I realize this question is a bit ridiculous, but I would appreciate some advice on my current situation. In a nutshell, I started preparing about six weeks ago for the September LSAT, with a diagnostic at 161. I purchased the PS bibles and have studied through most of the three books. I have also taken six more prep tests, the last three containing an extra section to mimic the experimental section of the real test. These scores were: 166, 170, 169, 169, 173, and 176. The final test (176) was taken as the first diagnostic for a test prep course. After seeing the 176, the test instructor told me I shouldn't take the course, since I wouldn't gain much from it.

At this point, I'm 10 weeks from the actual administration of the LSAT. I have a strong upward trend in my scores, and I feel confident that my true current average is somewhere around 171/172. I'm kinda unsure what to do now that I won't be taking the test prep course. I know I can just continue to take practice tests, reviewing my answers, making flashcards, and focusing on my specific faults (mostly Flaw and MBT in LR and Grouping in LG). I plan to take about 20 more tests in the next 10 weeks, and I have the time to do that and more if necessary.

Basically, have I missed something? Should I change my approach or include something that I've missed? I'm shooting for something in the mid-170s, and I don't want to get lazy/complacent/rusty. I would be grateful for any help!

You haven't missed anything. Absolutely do not take the prep course. There is a significant chance that you are better at the LSAT than the instructor. At best, the course will be a waste of time. At worst, it could damage your progress.

Your strategy is just as it should be. I would advise that you pursue it for the next two weeks, and then reevaluate if necessary. I.e., if your scores are lower than you would like them to be, then make another thread and ask for tips. But as things now stand, I'd put my money on you scoring at least a 172. You've increased your score by at least 10 points within six weeks, and you have that much time until the LSAT. You're obviously a natural, so I suggest mimicking test-day conditions as much as possible. I imagine your only obstacle on test day will be anxiety, rather than the test itself.