I'm not sure about whether you can improve, but a 165 and a 2.98 will get you in to many of the top 100 schools. A 165 equals an automatic scholarship to many T3s and T4s.
I imagine if you got a 157 (70th percentile) you could get into a lot of T3s.
Additionally, people are finally getting the message that going to law school is a stupid decision for about half of law students, so the admissions standards are actually relaxing a bit at many places.
Your problem is that a 141 is in the 15th percentile or so. A 165 is in the 92nd percentile. Since between 100,000 and 135,000 people take the LSAT each year, you will need to pass more than 80,000 people that beat you last time. (not the same people, but probably the same quality of people)
If your problem really is speed, I think you can make a big improvement. If you are slow, it really diminishes any other skills you have. That said, even if you go fast, you are still competing against a lot of smart and fast people, so the 92nd percentile is a lofty goal.
I did very well in law school and I have a good legal job. I consider myself to be of reasonable intelligence and I easily finished the LSAT sections in time, but 19% of test takers still did better than me.
I wish you the best, and I urge you to make an informed decision about law school. I don't think you have a high percentage chance of doing well or enjoying law school, based on what you've said, but it's possible.