We are basically trying to tell you that all this maneuvering is not necessary (or perhaps healthy). It also shows a misunderstanding of the priorities of college admissions offices. Just take calculus in senior year, with physics. As skieurope said, you will most likely repeat these classes in college depending on your major.
Instead of trying to exceed “standard AP’s”, do something that really interests you, expresses who you are, or is of service to someone.
I hope you will think about why Harvard is your dream school. It is a great school, but there are many great schools out there. Not worth twisting yourself into a pretzel over 
Often people who say Harvard is their “dream school” lack information on other schools, and I hope that isn’t true of you. If it is, do some research and think about fit.