Congratulations on pushing so close (and so consistently close) to your 700 goal! A couple thoughts for you:
-The "golden ratio" of GMAT success for MBA admissions has traditionally been 80-80-700 - 80th percentile on each section and a 700+ overall - although the extreme competition on the quant side these days may be making scores closer to the 70th-75th percentile on quant a little more palatable for that tier.
-In your case, your verbal scores are well within that zone but your quant is below, so I'd make sure to push quant a little bit. It depends on some other factors - where you're applying, how much of your work/education background suggests that you're good with numbers, etc. - but for my students applying to Top 10 schools I've been figuring that Q47 is about the minimum scaled score where I'd feel "confident" in their GMAT.
-Maybe more helpful - I'd also dig in and see if you find any "low hanging fruit" to pick up those extra 20-30 points. Do you have pacing trouble on either section? Are there common mistakes that you make in every test (assuming positive/integer on DS; answering the wrong question in PS; strengthening when you should weaken in CR, etc.)? Is there one content area that you haven't cracked but you know you could with focus? Numerically you're really close to your goal, so it may be less a "quant vs. verbal" path to 700+ but more of a "if I'm honest, what one mistake/concept seems to always stand in my way" thing.
-As far as the validity of your scores, you may want to take a different test (GMAT Prep, Veritas free test, etc.) to see how your performance matches on those. I think Knewton's tests are pretty good, but in case there's a pattern in the scoring or delivery it may not be a bad idea to validate your score with another system just to make sure you've covered everything, and while you do that you can practice some of the strategies you think will help you break that 700 mark too.