Longshots? Ranch-
Interesting thought. For myself I look for opportunities when a favorite looks vulnerable. For example, I typically post a vulnerable fav at Aqu or Bel every day. The vulnerable favs are winning at about 24.5%. But when they lose the average win price on the winner of the race exceeds10-1. I see these races as a good place to look for price horses. But I do use standard handicapping in this process.
I also remember reading an article regarding longshot horses. I always meant to followup with some research but never did. The premise was to build a list of positive handicapping factors. The factors could span any part of handicapping, trainer, pace, speed figures etc. The idea was to count the number of 'positive' factors each horse accumulated and bet well priced horses that earned a certain number of them. I will go back and do some research to find that article.