Hi feisty-nail,
First, a "pretty high score" means different things to different people, so the first question that I would ask you would be what
exact score did you get and how does it compare to the laws schools that you are considering.
For example, if you are scoring in the high 170s, retaking it to shoot for that perfect 180 may be overkill, although I understand the temptation, especially for people who are perfectionists by nature. I don't think that the most competitive law schools would necessarily view that as a bad thing, as high-achieving, Type A personalities are in many ways qualities that they expect.
Second, it is very typical for students to score a few (i.e. 2-3) points lower on the real LSAT compared to their practice tests, even when things go relatively smoothly on test day, probably due to test anxiety, stress, etc.. Of course, this doesn't happen to everyone, but it is a general trend and therefore really isn't surprising. (Ideally, students practice test scores should be a few points higher than their target score to have a bit of a "cushion" for this very reason.)
However, students do generally score better the second time, partly due to additional studying/practice but partly due to increased comfort level/familiarity.
If you've only taken the LSAT once and believe that you have a good chance of improving your score (even by a point or two, because every point counts), then retaking it makes sense. If you've already taken the LSAT multiple times, then it may become a more difficult decision, but is still worth considering if you are under LSAC's limit.
If you do decide to retake it, you
definitely should get score preview because the worst thing that could happen is that you retake it, have a bad day for whatever reason, and your score actually goes down (and you don't cancel it). This would look bad and may require an addendum explaining what happened. If you do cancel that score, however, no harm, no foul (assuming that is your one and only score cancellation).
Below is a link to Dave Killoran's blog post on this very topic. (Be sure to also check the comments section where Dave answers student's questions regarding specific situations that may be similar to yours.)
https://blog.powerscore.com/lsat/should ... -the-lsat/