Overall you look like an excellent candidate. Yes, your scores are a bit low but your sister’s presence will help a lot. I think the biggest consideration will be how you compare to other kids with a sibling who need full aid. Aid is a huge consideration in BS admissions. There are some great candidates who get waitlisted who need aid and there are some kids who get in with much lower scores and let’s just say full pay and connections (often legacy). Also you have geographic diversity on your side. I think you should apply to all the schools and see what happens.
Um…she’s already at Andover. Just wanted to point that out 
This thread is very old.
MODERATOR’S NOTE:
The OP revived it a few weeks ago with an update. It’s fine.
Hi AndoverKid257,
I showed this thread to my son last year and made him inspired about your 30 hrs a day like effort.
We found out that he got into Andover with outstanding students scholarship (still considering as FA) from special interest of his skill set especially music. Thanks a lot!