I am surprised that you got a response from EA, the fatc that it was prbably a form letter notwithstanding...
Other than with ties, there seems to be no advantage to finishing the contest early. I have finished 2 of them at 15 minutes before the end and some days early with the same results. In fact, most players who are leading in the early stages and finish early do tend to fall at the end. I have to believe that in the end, it is the amount of points you earn that determine your finish, not when you earn them?