I haven't taken the exam yet, but I've been scoring in that range on PTs regularly, so I'll answer anyway.
My first diagnostic, having never looked at an LSAT before, was a 168. That was in February. I decided I would set my real LSAT goal at 173, since I thought 5 points would be a reasonable amount to increase. Then I got a 173 on my second practice test. So I kept raising my goal, but then I kept meeting it. So now, my goal for Monday is 180 or as close to it as possible. I will not complain if I get a 177 or above.
In a way, I've been preparing for the LSAT my whole life - I loved doing logic games as a kid, I took two logic classes in undergrad which were among my favorite classes outside my major, my major was very logic-y, apply rules sort of thing, and I've been a big reader since I was young. Plus, I am lucky -- I've just always been good at standardized tests - SAT, state exams in HS, etc. These things all help me find the LSAT not particularly stressful, and I think being not stressed also makes me less likely to make careless errors.
When I started studying in Feb., I decided I'd do one practice test each weekend. I actually kind of failed at that, because it's been 17 weeks since, and I've taken 9 PTs. Still, my scores have gone up steadily, and they're now at a point where I don't at all regret not doing more. I do not study during the week. I have enough to do with my full time job, and I don't want to stress myself out more than necessary, and honestly, I don't really feel like I need to.
One issue I've had is that I am incredibly impatient, so I used to check my score so far after each section, and then I'd figure out how many questions I could get wrong on the sections left to achieve various target scores. I would also stop the timer as soon as I finished each section, rather than waiting for the full 35 minutes to elapse. Obviously I will not be able to do this on test day, so for my last three PTs, I have not allowed myself to do these things, used the scantron, etc., to get as close to the real experience as possible. I actually think it has helped -- my avg. since is higher than beforehand, although that may also be just having had more experience? Or again with the not being stressed, maybe? Not thinking "ok, I can only get 2 wrong here" and such? I also haven't even looked at the writing section. Ok, that's an exaggeration, I usually read the prompt with each PT, but I haven't actually practiced any. I think I will try to do a couple on my train home tomorrow, but, again, I don't want to freak out about it, because it is so insignificant. I read something by I believe it was the Michigan DoA who said they usually just glance at it to make sure you did it and took it seriously, so it doesn't seem worth agonizing over.
Generally after each exam, I look over questions I got wrong and ones I was unsure about (even if I got them right), but I can generally see why I messed up or didn't fairly quickly. I probably should look at every question, but I don't. I didn't purposely study in bad conditions, but I did do a few PTs on my porch, which can be somewhat noisy. The one thing I am a little nervous about is the length of time the whole thing is going to take -- LSAC website says to be prepared for 7 hours?! That's ridiculous. But oh well, I'll get through it. But how annoying if it does!
Not sure if I answered all of your questions. Basically, my study method was "take practice tests," which I did until I improved to a score I am satisfied with. I have one more (59) to take tomorrow, and then I'm calling it a day (or...calling it a span of several months?), relaxing Sunday, and then going in ready Monday. I really hope the experimental section is games, because they are my best section, I have fun doing them, and I then am in a good mood for whatever follows. I would be ok with a LR experimental, but I worry a RC exp. would tire me out, as it is the section I like the least. I guess we'll see!