GMAT Strategy

Dear all, my story have started 7 months ago, exactly in february, when I have decided to prepare for the best climbing in my life so far. 

Before to proceed with my issue, let me jot down some facts about me; in this way you can have a context to better spot my problem.

I am not a native English speaker -Italian is my mother tongue  - and albeit I worked four years in foreign countries such as France, Mexico, Libya, Algeria, and Sudan I did not really need to master English because I was doing an operational job in the oil&gas exploration field, precisely on offshore platforms and well rigs - in that jungle the leadership, technical, and personal skills are more important than an educated language.
Two year ago I changed my career path, looking for a more business related position and today I am in the marketing and product leadership function, still in the oil & gas. One year ago I thought that an MBA is what I need to boost my career toward the business jungle and at February '11 I have started to climb the GMAT mountain - by the way I like free climbing!

I have studied four months before to give my first attempt in June, struggling with the limited time -my job requires me be on a flight for 2/3 of my time- but the result was a poor 580. I didn't surrender and I continued to study harder and harder to prepare my second attempt. I went throughout MGMAT sc, number properties, advanced quant, rc, cr bible, btg forum, og 12 guide, magoosh practice questions and a course with a professional instructor called Bob800 - he is an excellent instructor. 
However, during this study period I never took a full GMAT test. I  took a week of vacation just before the test day, which was Sep 12th, and during this period I did 6 tests whose scores were:

GMATprep 1 670 (Q51; V30)
GMAT rep 2 680 (Q49; V34)
MGMAT CAT 1 650 (Q46; V34)
MGMAT CAT 2 650 (Q45; V35)
GMATprep 1 680 (Q48; V35)
GMATprep 2 710 (Q49; V38)

Average score 670 (Q48; V34)

I had confidence that I would be able to climb the 700 rock, but I failed and I couldn't pass over quote 590 (Q44; V27) ... % decrease vs the average of the simulations 12% (Q(8%); V(20%)).

Now the challenge between me and the GMAT mountain have become a personal matter ... I cannot accept the idea to be stuck at this quote, I must dominate this mountain, reach the top (MY mountain is not the Mount Everest ... thus 700 is the top for me ), and see how the horizon looks like from there.

How can I improve my score? I think to have studied enough for the exam and that the problem is more related to my performance on the test day than to the preparation I have. I have tried to address a couple of week points in my preparation that probably compromised my performance on the test day.

First, I think to have burned out my energy in the preparation week before the exam ... probably I should have been more constant in doing test simulations during each weekend until my score became stable.

Second, I think to have a major weakness in the verbal part, because I experimented a "panic stare" situation during the exam. Indeed I was not even able to understand the meaning of the questions. Probably I should focus more on creating the stamina and becoming comfortable with educated-english reading than on mastering SC rules.

What do you think experts? On the basis of your experience you should be able to recognize the pattern even in this case ... what i was doing wrong.

I plan to schedule the final round in a couple of months. But what to focus on during the next two months?

Thanks,

Emanuele