If you are really intent on retaking the exam, I don't see any reason why you can't register for the exam and study for the verbal in the weeks before the exam.

I agree...

Since you did score higher on a few practice exams, that would indicate that you are capable of a higher score in general. I often encourage students in your position not to wait too long to re-take, and to continue to maintain their current skills, while spending some extra time on any specific areas they feel they struggle with, such as the verbal that you mention. It’s also important to keep focusing on timing, and practicing on the computer, and to maintain the level of studying until the next exam date. Keep in mind that even the real GMAT has a +/- 30 point margin of error, or a given score could vary by 30 points on different days, so that plays a role even aside from your additional studying.

Do spend some time practicing those tougher questions, as well as the average to above-average questions—you have to be great at the 600-700 level questions to get to questions at the higher level, and remember that your estimated “level” is where you’re only getting about 50% correct, or every time it gets harder, you get it wrong, every time it gets easier, you get it right…

Good luck!