I have a question. I have been studying for the LSAT for a good 4 1/2 months now, and the practice tests that I've taken indicate good results. However, I have come across a hurdle, as it were. The most recent test I took was Prep Test 52 (began using the LSAT trainer), on which I scored a 172 (-3 LR, -2 LG, -2 LR, -2 RC). I used up all my time for the first LR and the LG (the 2nd logic game threw me off because I said screw the inferences, and dove right in), but for the second set of LR I had a good 2 1/2 minutes left, and for the RC I had 4 minutes remaining. I did return to one of the questions on RC that allowed me to fix one answer, but there was one passage of which I was uncertain (the game theory evolution one). Now, ever since I picked up the LSAT trainer, it has done magic for my RC, as I have not gotten less than -3 on RC since then. However, I was not willing to reread the entire passage using the structural approach that they suggest, because, hey, it was a long test and I wasn't having it. The same with logical reasoning. I begin to re-read stimulus, and I just can't subject myself to such torture.
So, my question is: If you ever have extra time, how do you review those dubious answers without feeling like you are expending a significant amount of energy? Is it just something that I have to force myself to do? Like reading all 5 answer choices (although I admit not always doing this...)?
I just don't want to plateau right here. I have never hit -0 on LR, and I feel that at least getting -0 on one of the LR sections is essential (with games and RC it goes from -0 to -2).

Also (mostly because I am self-conscious), please don't misconstrue this as my gloating about how well I am doing. I am actually terribly afraid that I perform really well on PTs, but will suffer some severe anxiety attack on test day and totally bomb.
Also, in anticipation of any questions pertaining my 4 1/2 months of studying: I actually have studied for this long because I forgot to register for the June test (although this may not be so bad considering what I've heard). I thought that I had used my final waiver, and the day before the exam, when I was going to print out my ticket, I saw that I hadn't registered. I know, I'm dumb.
So, any tips, advice.
Also, how do you guys REALLY, REALLY conquer those extremely difficult LR questions? Sometimes I can't even identify them, and they end up biting me in the butt! It makes me feel dumb when prep books say that it's all a structure, and all questions should be answered under this structure... However, some questions (1-2) on the LR section just seem unanswerable, and it vexes me beyond the point of belief.