Good thing is your performance in quants is consistent.
You have to improve in verbal.
Lets take your concerns one by one :
1) Timing :
First and foremost. Leaving a couple of questions unanswered is bad

, WORSE than answering them incorrectly. Its like the
Titanic of GMAT facts. It is well known, it is huge and it can drown you. Blank answers have a more severe penalty than wrong answers.
So lets say if I have 4 questions left to answer and just 2-3 min left, I would most probably guess the first one, solve the second, guess the third again and solve the fourth. Coz answering two wrong in a row is not advisable either. You must know when to move on from a question, if you have already devoted more than enough time on it. Even 700+ scorers do that.
2) Strategy :
I shared my strategy in brief here :
when-to-take-the-test-and-how-to-improve-my-preparation-154880.html#p12405213) Time left before the test date :
Although people have improved verbal score in a span of few weeks, if you don't feel confident say 8-10 days before the test date, you can reschedule.(I did it last year, but it didn't improve my score

)
4) Time Management :
I am taking this again because I feel this is your weakest point. Here is a link to a good article on how to tackle this issue:
https://www.manhattangmat.com/blog/index.php/2011/06/21/everything-you-need-to-know-about-time-management/5) Practice Analysis :
Even if you are practicing, do it under timed condition. I use this timer (Check the attachment) and its very useful. I don't know how you practice , but if I practice a set of problems from OG, I even go through the explanations of the questions which I got correct, especially for verbal.
Also use the test report generated at the end of your Kaplan CAT. See on which questions you spent more than appropriate time. Analyse them. Check how many of them were correct. See if it was worth spending those extra minutes on them. See how many easy questions you got wrong (Coz answering an easy question incorrect is more awful than answering a hard question incorrect.)

I have a hunch that just by guessing and moving on the few questions on which you are spending more than 2.5 - 3 min in verbal, you can improve by as many as 6-7 points in verbal. I am not saying guess every other random question just to save time. You should know which questions you cannot solve.
Good luck improving.