I'm also a student at Cornell, and I love the HCEC. They made the process easy, they kept me motivated to stay on schedule, and Judy and Janet offered some great advice along the way.
I don't think the August submission could affect your application in such a negative way. My application was submitted the same day as yours and I received interviews at many great schools, and have been offered acceptances.
August is still very early in the application cycle, your application was not impacted by the August submission. Medical schools know that it is Cornell's policy to release letters in August, and I don't think Cornell students are placed at any disadvantage...in fact, I noticed an unusually large number of Cornellians at the interviews I attended.
I think you should take a close look at other areas of your application, and figure out where things went wrong. I don't think the submission date has anything to do with your situation.