There was someone on the April thread who scored ~500 on TPR FL's but reported a prelim percentile rank of 90-100 from test date. Also, if it means anything, on the old MCAT TPR and other test prep companies FL gave scores lower than AAMC. There would be people who scored in the high 20's for TPR and get low 30's for AAMC practice tests and their real MCAT. But I'm sure that there are some that may do better on TPR tests so you never know. The belief is it's not too representative because it relies on content knowledge more than an AAMC test would. People on here are saying that the EK FL's are the most representative at the moment.
My FL scores so far:
TPR #1: 500 (pre-content review; also took AAMC 11 a couple days before and got a 26 if its relevant)
TPR #2: 505 (today)
I plan on taking one more TPR test, one EK test, and the AAMC test before my test date next month. I plan on giving a review of how each one felt compared to my real test after test date as well.