Are you overthinking it? How well prepared are you? Pushing it back isn't too bad but it'll start getting to the late side. It takes several weeks for ADA to upload to AADSAS and then AADSAS takes their turnaround time to send to schools. Some schools accept unofficial transcripts, but not all of them. I know some people that applied on the very last day before the deadline who still get in with average scores, but not everyone gets lucky. Weigh your options before you decide to postpone.