Well it sounds like you are putting in a ton of effort and 143-146 are not amazing scores, but they are not terrible. I believe it puts you slightly under the top 50% of test takers.
A 165 may not be doable, to be perfectly honest it would put you in the top 20% of test takers and as you learned in your prior experience at the other law school it is not easy being in the top 50% of the class, let alone the top 20%.
I suppose you can take a Kaplan or other LSAT program, but again a 165 is difficult to get.
Additionally, the law school rank really does not mean that much, my school went from being a top 100 school when I enrolled to now being 138th I think and my job has not fired me, nor has a job denied my motion, in fact believe it or not the only time i ever discuss law school rankings is on this board. As a lawyer it never comes up.
Remember U.S. News is a for-profit unregulated magazine that has found a niche making insecure law students think it means something. Since you have gone through 1L you know the stress, confusion and insecurity that is prevalent in any 1L class. What better way to make money than to make up some ranking based on nothing in that situation, it is a genius move on their part, but it really means nothing.
So as to getting a 165 all you can really do is take the LSAT again and see what happens. If you want to spend a few thousand more dollars enroll in a course, but there is absolutely no guarantee you will get a 165 and odds are if you got a 143-146 originally a 20 point jump is unlikely, maybe a 150-155 is doable, but even if you got a 165 the bigger issue will be not getting academically dismissed.
A good LSAT score doesn't mean anything once your in school and more importantly even if you get a 165 on the LSAT it does not mean your passing the bar either.
Good luck to you, but don't set unrealistic expectations on yourself. Law school is doable and even with a 143 LSAT you can graduate from law school and a get a licensed to practice law. What you do with it after that it is up to you.
Here is a good article http://www.legalmatch.com/choose-the-right-law-school.html
that explains how to choose a law school, even if you get a 150, 165 and I personally hope you get a 180, but since only 1% of people get a 180 there is a 99% chance you will not.