Hmm, due to personal circumstances I would probably take an extra year off to prepare again. I would probably take the extra time to let myself decompress a bit, reflect upon what went wrong this time, and have more time for more additional AAMC material to come out seeing as I've taken all of the AAMC practice FLs (they will probably release another FL this year after testing ends in September).
I guess the harder question for me is at what score would I decide I should retake? I would be okay with scoring maybe 2 points lower than my AAMC FLs -- a little sad that I didn't do as well as expected, but I'd take it. Around 3-4 points lower, I would be rather upset but ultimately probably wouldn't retake because they would still be good scores, just not the ones I wanted. Above 5 points lower, I would start seriously thinking of retaking because at that point I would think something specifically went wrong in my thinking during testing, and I would no longer be competitive for the schools that I want to apply to.