I know some of the people who’ve posted on this thread are very knowledgeable and insightful posters in general, so I’m surprised that nobody’s pointed out one thing: Harvard doesn’t offer ED. So @tleplaearthur should know that his chances of getting into Harvard ED are exactly the same as any other applicant’s: zero.
Harvard offers SCEA (Single-Choice Early Action), and I think OP would have a better chance than most Harvard applicants on the whole.