I wouldn’t wait, as you can take the SAT in October (for free, if you took the June test) and still have it get to BU in time for ED. Overall your application looks good, try to get another leadership position next year if you can.
Please chance me back!
http://talk.collegeconfidential.com/what-my-chances/1782833-chance-a-rising-senior-for-uchicago-georgetown-ivies-etc-will-chance-back.html#latest