Well, it has certainly crossed our minds.
I'm not sure that it matters. It's not like she finds anything about either test "hard" at this point, and with the SAT in particular, she seemed to have some trouble reading "down" in the literacy questions even last June. I suspect that this problem would be likely to get worse rather than better, in fact. She made the same claim about the practice SAT Lit that she tried.
The AP Lit and CLEP questions were much easier, which probably reflects the fact that she tends to read questions too deeply.
My long explanation for "maybe-- but probably not really given that her LOG still means that she has to adjust/read a more NT mindset in multiple choice questions."
I'm not sure that she's going to get enough better at that skill (which is, realistically, what such things are testing for most EG/PG kids who are at college-readiness levels) that it would matter by the time she were 17.
My hypothesis is that if anything, taking it age-normed may make it even harder to do. Adolescents aren't exactly known for their tremendous mad skilz at perspective-taking, KWIM?