A Wizard shouldn't flip. It might be your grip, and OAT. I had the same problem when trying to drive with my Ions, which are just like Wizards. I did some field work, and slowed things down, concentrating on throwing clean, and smooth. The power grip didn't feel right at first, and it was affecting my putter drives. Once I was able to get used to the grip, and smooth the throw, my putter drives have greatly improved.
MVP Disc Sports