It's true that retakes generally don't change the score much - with low scores a slight improvement is typical with appropriate preparation.
The LSAC publishes data on how repeat test takers fare on subsequent LSAT tests. 24.1% of test takers take the LSAT at least twice. For a first score of 152 here is how repeat test takers fared (from the
LSAC's LSAT info book):
3 scored between 130 and 139
143 scored between 140 and 149
941 scored between 150 and 159
129 scored between 160 and 169
So in general, the average is not far from 152 on retake, but a bigger risk of scoring under 150 than above 160.
The former dean of admissions at U Chicago says that if a student scored 10 or more points better on retake, they gave the benefit of the doubt and kept the higher score. Do you think you can prep enough (and spend the money on a serious prep course) to bring your score up 10 points? Based on repeat stats, I would recommend not retaking, but if you are confident in your prep you might want to take the risk.
Have you already tried the
law school search tool on this site?