In the Shack charts betting the favorites was a loser overall. So how many times in 7,167 did Plus EV lay a favorite? How well did he do betting favorites? If he showed a profit betting favorites then it's impressive considering the overall stats. I have to assume he bet favorite only when his algorithm gave a different line than the book's line.
Plus EV's results are actually pretty good if we are to believe what others like Spanky and Krak have said. They say they only make a buck or two per one hundred wagered. That's why they are pissed about having their betting capped. And Krak did make the statement "I bet a lot of dogs." That's probably information that a lot of them don't want out there. I think these guys are hip to heavily betting the dogs.