You can only miss about 10 maximum to break the 170. As you mentioned, RC is your hardest section.
This is what I would recommend:
1) Focus on accuracy (without strictly timing yourself) - when you do that, do you still miss 10 per section?
If you do, then you need to work on the accuracy portion. Analyse the questions that you got wrong. Figure out why you picked the wrong one and what makes the correct one right. RC tends to have the same kinds of questions over and over again.
Work on some strategies...for example, it helped me to go back to the "main point" question after having gone through the other ones, for example.
2) Then start working on timed passages. I used to set the timer at 8 minutes per section and only worked one section at a time. This way, once the timer went off, I marked where I was...then timed myself to find out how long it actually took to finish the section. I marked the questions that I got wrong (not the answers) and worked those questions again to make sure that I got the correct answer. I needed to understand what I did wrong and why.
Often, I would work that section again to see what I missed when I had read it timed. I also worked on a quick marking system. For example, I circled names, underlined lists and examples and made a small one-letter notation on the side of the text (L - list, A - author's point of view, E - example). Having those notations helped me find information fast when answering the questions.
I know that the current LSATs tend to have one difficult reading passage. You will need more time on that one. Maybe you can work on doing the easier reading sections in 6 minutes? This way you will have more time for the more difficult passage?
Here is a list of difficult reading passages:
Prep Test # 20 Questions 7-14
Prep Test # 22 Questions 22-26
Prep Test # 24 Questions 21-27
Prep Test # 25 Questions 22-26
Prep Test # 27 Questions 8-14
Prep Test # 30 Questions 15-21
Prep Test # 31 Questions 21-28
Prep Test # 32 Questions 8-13
Prep Test # 33 Questions 23-28
Prep Test # 35 Questions 15-20
Prep Test # 35 Questions 21-26
Prep Test # 37 Questions 22-26
Prep Test # 38 Questions 15-20
Prep Test # 39 Questions 17-23
Prep Test # 39 Questions 24-28
Prep Test # 41 Questions 21-26
Prep Test # 42 Questions 8-15
Good luck! You can do it! Vera