You will always get some tearing with v-sync off. Setting v-sync to application control in the drivers does not necessarily mean it's off btw, even setting to always off doesn't guarantee it since it can be over-ridden by the game. The only way to guarantee it's off it to use the games own setting (where there is one) and have the drivers on application control or always off.
It won't always be as noticeable though, it can depend on all sorts of things - framerate, refresh rate, perception and eyesight of the user (my dad for instance would never notice it or be bothered by it), the contents of the screen (tearing shows up mostly on vertical boundaries like wall edges, lines etc), and probably loads of other things.
You only have two options, turn on v-sync or put up with it. If your game is running 150 fps, just turn v-sync on. Doing so will limit your framerate to 60 fps (or whatever your refresh rate is), but that's no big deal since it's not like your monitor is currently drawing 150 unique frames per second. The video card is outputting 150, but the monitor is only changing 60 times per second, hence each frame you see is actually a splicing of 2-3 frames, and hence you get tearing. Better to have 60 complete frames.