Drivers for graphics card are up to date? Try Vertical Sync
Adaptive instead of On making sure Tripple Buffering is set to On. Sorry for the repeat info... just making sure. Last ditch-effort; Does it stop tearing in Windowed mode?
You can also try using
RTSS Rivetuner. RTSS Rivetuner needs to stay open in the background when you play the game in order for it to work. You can set this to start up with Windows. Set frame rate to your refresh rate (60) application level medium. I've never used it before but you should be able to look up how to use it via Google search if you need to. I'm kind of stumped when it comes to screen tearing despite V-Sync in place working properly.
Chester might have ideas and I'm sure she wouldn't mind if you PMed her about this.