Take a look at the admissions profiles on LSAC. You can find your numeric range and see how many applied to each school and how many were accepted with similar numbers. It will give you a very good idea as to your chances at a particular school.
Side question: If I retook and got a 160, do you think it's worth applying to better schools?
Well, obviously higher numbers equal broader opportunities. A score of 160 would probably give you a somewhat better shot at Loyola, but if you look at the admissions data on LSAC you'll see that the UCs would still be a longshot. It's all pure speculation at this point, however. You could just as easily retake the LSAT and get a 155.
Also, don't get too caught up in the idea of "better" schools. The minute, subtle differences in rankings that law students tend to obsess over don't play as big a role in the real world. My experience has been that most employers tend to view law schools in much broader terms. They don't really care that Loyola is ranked a few places above Pepperdine or vice versa, they view both schools as basically equal. An employer that is willing to hire from Pepperdine is probably willing to hire to hire from Loyola, too. As far as biglaw, they'd prefer Harvard and Yale anyway.
The fact is, once you get away from the elite pedigrees most law schools won't either help you or hurt you. Your ability to make positive connections and to gain relevant experience will play a larger role than the fact that you went to the #65 ranked law school, whereas your competition went to the #72 ranked school.
If you're looking at non-elite schools I would focus more on location and $$$. For example, you mentioned USD as an option, a school with a good local reputation and a great choice if you want to live and work in San Diego. If you want to live in LA, however, I think you'd be much better off going to someplace like Pepperdine. In fact, I think you'd be better off going to Southwestern even though it's lower ranked. Why? Because although USD is a good school it's not elite, and you won't be able to rely on your pedigree to open doors. You'd have to hustle and make connections in LA, try to land an internship or summer associate position, and you'd have to do that from 100 miles away. If you simply show up after law school without local connections or experience, finding a job can be very difficult.
Just use your common sense and don't let some ridiculous rankings scheme determine one of the most important decisions in your life.