Hello there,
First of all congratulations on your success

and thank you for sharing your experience.
Your experience about the GMAT felt as if I wrote those words myself! I gave my GMAT this week and I am targeting for Insead Jan'19. I tried my best to take some days off from work, gave approximately 8-10 mock exams. During the final exam, I had to rush in the end for Quant section and I felt I messed up my Quant. This affected my verbal performance and I was panicking constantly.

In the end, I got a score of
680 ( Q49, V34, IR6) above 70%ile in all sections. I am very confused about how to proceed.
My brief profile:
o Indian Female, IIT graduate (Bachelors and Masters of Science), GPA 4 (CGPA 8.5/10)
o +5 years in Oil and Gas Technical Consulting (One of the two largest oil and gas services company in the world)
o Travel to Middle East, Africa, South Asia for Projects and work with a multi-cultural/diverse team and clients
o Passionate about my work, hence present/publish for conferences at US, Europe and Asia
o Extra-Acads: In college was into organizing stuff- Placement Committee Member, Cultural Fest; Swimming competitions;
-Also worked with social ventures during my internships
-Currently, Coaching and mentoring (My expertise is niche and valued, hence active in my technical community to develop more resources)
At this stage, I am saturated with my GMAT prep and Insead is the only school I am keen for my MBA. I want to apply for round-1, however I think a low GMAT score would diminish my chances of acceptance. An alternative is to continue to work on my application now and then give GMAT again for round-2, but I am afraid if my score does not improve, I will be at a much more disadvantageous position (Round 2 over Round 1).
I will appreciate all the feedback I can get.
Cheers!