Applying late is the kiss of death for every applicant. I took an August MCAT (for the first time), scored a 37T and only received two interview invites late in the season (March/April).
Have you thought about DO schools? A 28 is fairly competitive at the top DO schools.
Your MCAT is not horrible. The national avg. is kept around 24.
Matriculant average is around 30-31. The 10th percentile of all matriculants is a 27. The national average may be 24, but the number that matters is the matriculant average.