Hi bunny12345,
GMAC has publicly stated that the Official Score that you earn on Test Day is within +/- 30 points of actual ability. Your 3 Official score results show that you essentially performed the same each time (about 630 +/- a few points). You handle certain aspects of the GMAT consistently well, but you also make certain consistent mistakes. To score 700+, you'll need to make some significant changes to how you handle the overall Verbal section. Based on what you've described, it's likely that you're spending too much time on your SCs (on average) and that THAT is what's actually causing your pacing issue (and not the occasional "long" RC passage).
Before I can offer you the specific advice that you’re looking for, it would help if you could provide a bit more information on how you've been studying and your goals:
Studies:
1) How long did you study before each attempt at the GMAT?
2) What study materials have you used so far?
Goals:
3) When are you planning to retake the GMAT?
4) When are you planning to apply to Business School?
5) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich