Does it really matter what your chances are? I'd put you at 53%, I'm pretty conservative, but since the DOW went up today I might drop you a few basis points.
As a DO you're going to be hte underdog. Your only option is to apply to as many places as feasible for you (I applied to 40+) and see what sort of itnerviews you get.
If we said you had no chance, would you apply anyways?
A good applicant is a good applicant, MD, DO, DC, PT, HIV... you seem like a good applicant.
Q, DO