Do you know why the 3 schools didn't offer an interview or acceptance last year? If not, I'd call them to see, hopefully you can get feedback from the schools before the aamc primary is completed. Also, be careful about which areas ec's are listed under, for some schools the ec does not "count" if not listed under the section they're reviewing, especially leadership/community service work.
If the app was completed/turned in prior to the deadlines last year, it could have been reviewed. Tougher standards late in the year, but absent an interview/acceptance, there likely are areas that can be strengthened in your background that can be discussed in this year's personal statement, even if only a more recent example of things learned through clinical experience. I'd suggest adding something more recent to the PS, leaving it mostly the same if you & reviewers feel it is strong.