I think this method should work fine.
If you have stats like 3.7+/22+, do not waste your time and money. Just apply to a few that you are very interested in. (5~7)
Stats like 3.7+/20 or 3.5/22+, apply to the schools that you are interested in plus a few backups. (7~10)
Stats like 3.5/18 or 3.3/20 or 3.0/22+, apply to the schools that you would go if they let you in. (15~20)
Stats like 3.3/18 or 3.0/20, apply to as many schools as possible and hope for the best. Or, take DAT again or do post-bac.