The meat 'n potatoes to any app is your undergrad GPA and the DAT. Nothing can get around a super low score in either of those. You can have 10,000 hours rescuing burning babies and have cured cancer and you still will prob not get in. Why? Because they won't even get to the rest of your application. Most schools have hard line cut-offs so you MUST retake the DAT.
A little bit of, "truth hurts" coming......honestly, if you try your very, very best and study your butt off for 3 months and can not get higher than a 16 on the TS, its possible you won't make it through D-school. The classes are fast paced and you have to know a crapload of info in a very short amount of time, while at the same time spend half your day developing hand skills.
You think the DAT is hard? Wait till you take the NBDE1!!
I do wish you all the luck. Remember, determination beats aptitude, 8 days a week!