well if you got the game from steam, you can right click the game, manage, controller settings... and switch the right stick to "joystick mouse" and adjust the sensitivity and remember to configure the action of the "right stick Click" to the corresponding button and well... that is how i did. I have 600 DPI and got the in-game sens at 6... I configured the right stick sense from the steam configuration to "0.200" points and feels quite smooth.
it is a good solution and does not affect the gameplay in bad ways at all, just a little annoying to navigate through the menu.
