Increase Verbal score from late 20's to late 30's (28 to 38)!

Dear GC members,
I would like to walk you through my GMAT preperation and Exam performace.
I have appeared twice for the exam, the results of which have been summarised below

November2012- 510 (QA41, V20, IR3, AWA4)

I took the first attempt, after working 3yrs at different FMCG majors in India, when I aspired to ace the Indian MBA enterance exams and did not prepare for GMAT extensively. Even though the topics tested in the exams for Indian B-schools are similar to that of the GMAT exam, I was not adept to the GMAT exam structure and the basic nuances of the test. This meant that even if I was thorough with the content, I was not aware of the finer details including , but not limited to, the ADBCE approach in DS, the common errors on SC, the question types on CR. I had used OG13 to aquaint myself with the question types but, as it turns out, the GMAT exam commands more than aquaintance. I procastinated the idea of MBA and focused on my family business and revamped and upgraded ways in which the day-to-day operations were conducted. But after reaping benefits of current set of ideas, I have hit the sealing. Moreover, the opportunities that i seek to tap in short-term at my business can be achieved only if I gain further knowledge and hone my skills. This motivated me to again buckle up for prepartion but with a significant difference. This time focused all my attention on the GMAT exam.

Come March2016, I started preparing again and accessed my current standing on GMAT Prep Tests
GMAT Prep Test1- 490 (QA32 VA25).

This was followed by revisiting the concepts from the MGMAT books set and the 60 Day study plan. Along side, I enrolled for the Veritas and Manhattan Test Series. Throughout my test series, my score range was 550 to 640( QA39-47 & VA 29-34), which was still below my aspiration score 680-700. Approaching the scheduled test date of September, I started laying stress on Verbal section, which was low hanging fruit.

September2016- 610 (QA46, V29, IR6, AWA-result awaited)

The basic flaws that I currently seek to address in my preparation are
A.Verbal
1. SC- I have not been able to master the SC rules. I still rely on my ear for convulated sentences.
2. RC- Their exists a negetive corelation between my score and difficulty level in RC questions
3. CR- I'm comfortable with all types of question but evaluate the argument.

B. Quant
This section is not that troublesome and I know the few topics that I need to practice and improvise on my technique.

I have to ensure a Gmat scrore of 680-700 to design a worthwhile application for the above programs. I seek your valuable inputs on how should i make the jump from Current 610 to 680-700 levels.