I submitted my primary around this time last year and got plenty of love. Wasn't even technically complete until mid-October when I got my MCAT scores back. You'll be fine if you have decent stats.
I didn't send my application til late October/November. I'm not saying you should do this, of course, but clearly my experiences shows that you shouldn't give up too easily just because it's September.
Seriously, you don't seem to be in danger with those stats for a DO school. However, I don't know if they're still accepting the old MCAT in their application now.