just a thought on your essays–try to consider you want the reader to get why ND is a good fit for you and why you are a good fit for ND. Take the experience you are writing about and how ND will create the opportunity for you to take it farther–why ND would want you to bring that experience to campus and make it better.
The school is going to have its pick of folks with all the same great numbers/activities like yourself–your task is to show what distinguishes you from that pack, how you will add to the ND community and how ND will make you better