I took the GMAT earlier this year and scored a 670 (Q: 47, V: 35); IR: 6; AWA: 6. The GMATPrep mocks I took before this exam were 690 and 710. I don't recall the splits, as I have since uninstalled and reinstalled the software. I was disappointed with my score, but I knew verbal did not go that well as I felt hesitant about each SC answer. I purchased the enhanced score report, and the report confirmed my suspicion about SC not going well (68th percentile).
I took about 5 months off before finding time to study/prepare for the 2nd go-around in 3 weeks. I wanted SC to feel second-nature, so I focused on that mostly. I used Aristotle SC to develop my foundation and actively created sentences instead of memorizing rules. I also tried an unusual approach and did not use the OG book for practice. I purchased the additional problems and exams from GMAC, and I only used the SC questions on the software to practice. I did this to adjust my mind/eyes to the actual test day approach I would take, in which I could just scan and look for errors. I found that much harder to do using a book; perhaps I'm so used to reading everything when printed. Leading into the exam, my GMATPrep scores were 710 (Q: 47, V: 40), 740 (Q: 49, V: 44), 710 (Q: 47, 41). I didn't focus much on Quant because I felt that I recalled the material pretty well; however, in hindsight I feel some regret towards that approach.
Today's breakdown was 700 (Q: 47, V: 40); IR: 8. Ultimately, I'm pleased that I did improve my SC, and throughout the test SC felt comfortable. I'll be purchasing the enhanced score report to confirm my assumption. I am considering a retake even though I told myself 700 was the minimum I would accept when I first signed up for the GMAT. I don't plan on applying to school until 2018 at the earliest though and median scores of my target schools seem to go up each year, and this makes me nervous (why I regret not focusing on Quant, as some improvement there would have given me some bump in the score per the raw table).
Hope this post helps anyone struggling with SC! You can get comfortable with SC and make it feel second-nature.