The last section of AACOMAS is a list of all the schools with check boxes -- you check the ones you want to apply to, and hit submit. You do the same thing any time you want to add more schools, but it's slightly more expensive if you do it that way. The 'deadlines' are very misleading because it makes you think you have all this time to perfect your application when in reality an application submitted anytime past October is considered 'late'. Personally, I think the value of an application (as well as the physical money that you're dropping into the process) drops significantly once September passes -- but I understand that timing is not perfect for everyone and that it is definitely doable in those cases.
My concern is that the F you received in physics will likely screen you out from the admissions cycle altogether -- because you wouldn't be meeting the pre-requisite course requirement that all schools have. This would force you into waiting until the end of your Fall semester to apply (December-ish I'm assuming) which is definitely too late. So naturally, in this case, sitting this upcoming cycle out would be in your best interest. Applying after you graduate will allow you to repair that tragedy in your application, know your MCAT score beforehand (allowing a more custom list of schools to aim for) and do so MUCH earlier in the application cycle.
Get another opinion.
@Goro