Risk it?

Um, the EA pool at Harvard is not “weaker,” at least in Harvard’s eyes. They take 80% of the athletic recruits because it fulfills an institutional priority, and 13-14% overall. The RD pool is weaker, hence they take only 2-3%. And those who are deferred or denied by other top schools are not the strongest candidates; they’re middling or relatively weak; otherwise, those schools would have taken them.

OP’s profile is not exceptional for Tufts, and ED2 might be advantageous. Midrange stats are don’t lead to a high likelihood of admission in RD, as only 15% overall are admitted. https://admissions.tufts.edu/apply/enrolled-student-profile/