As long as you do well in the rest of your pre-reqs and get a 505+ on the MCAT, I wouldn't waste your time or money on an SMP or post-bacc. Your sGPA and cGPA are average for DO schools. Just continue to do well and study hard for the MCAT! Also apply early in the cycle. I have a 3.35 sGPA and 3.45 cGPA and have 5 interviews already, you can do it!