You can always submit everything with your current score and also indicate the retake date. Some schools might even interview without a better score, so this can take your studying time. Thus, imo, you should only concentrate on studying and doing better on the MCAT.
Oct is very-very early for the Pod cycle. Doing well on the exam will grant you some type of scholarship.
Also, if you didn't already, buy all the practice questions from the AAMC including the section banks and the subjects packs. Doing more questions and going over both right/wrong questions is key on doing well.