Help!

I purchased this game as well as an app called Joystick Mapper, so I could configure my Playstation 3 controller to my Mac. All went well, the buttons configured nicely, although the sensitivity when I aim down the sights is ridiculous aha.. Its so unbelieveably high that it is impossible to kill anybody. If anyone has any advice on how to fix this I would greatly appreciate it.

Goooooooobz about Call of Duty®: Black Ops, v1.16