First off, congrats on getting pretty comfortable in that 700 range - lots of people work really hard to get there, so let's not lose sight of that!
And as it looks like verbal is what may make or break your "well above 700" attempt, let me admit this on behalf of all test prep everywhere - challenging verbal questions are really hard to write with high volume. What one day looks like "a really clever trap answer" might end up actually being "a valid answer that isn't totally wrong", just as what might look like "a subtle, well-hidden right answer" might actually be just ambiguous enough that it wouldn't make it on the real test. That thin line between "devilishly clever" and "actually kind of flawed" is what makes verbal really hard, and on the official test they have enough data validity and budget to make it happen frequently, but on the test prep side you may well find that:
-If your CR percentage is wildly higher on one test, maybe those questions erred on the side of "let's be safe" with the difficulty, so they weren't as hard as they could have been
-If your CR percentage is significantly lower on another test, maybe those questions pushed that thin line a little far and just didn't have that purely objective "definitely right / definitely wrong" dialed in all the way or pushed the scope of what the GMAT might really test (sometimes you see more LSAT-style stuff that just wouldn't make the GMAT)
Which isn't to say it's bad practice at all, as the lessons you can learn from those problems/solutions are really powerful and for the most part there are a lot of good questions out there. But if you're finding somewhat erratic results and you're in the final days of prep, it's probably time to go with all official verbal problems to really be sure.
So with two weeks to go and your having learned most of the content/strategy you'll use on test day, I'd focus on using official (GMAT Prep,
Official Guide) verbal problems to practice employing all of your verbal strategy, and tracking which kinds of mistakes you're making. And make sure you analyze your wrong answers and "guessed right" answers to ask yourself why wrong answers were tempting to you, as often you'll find that when you're on the verge of "verbal greatness" you're held back more by the traps you fall for than by just not knowing what you're doing.