I wouldn't - it takes 4 weeks for aadses to send out your app ONCE IT"S COMPLETED. Really if you submit everything tomorrow including all your transcripts and reference letters and personal statement, etc., it will be mid-january before the schools get your application. That's quite late. I'm taking the dat in Dec too but my app hasbeen in since Aug. And I think my chances are quite slim as it is.
I would wait till next cycle. An extra year really isn't the end of the world and you would probably waste a grand or so if you do it now.
Good luck whatever you do.