I would say you have a pretty good shot! Great ACT and average GPA will help balance out. Additionally, your extra-curriculars are sparkling, showcasing a lot of future potential and leadership. I believe this will definitely help to set you apart from others in the applicant pool, giving u a pretty good shot (but its the Ivy’s, so u never know :/)
Good Luck!
Also, chance me? http://talk.collegeconfidential.com/what-my-chances/1833338-chance-me-for-ucs-and-usc.html#latest