Crazy mouse sensitivity when aiming. (Bulletstorm)

Good day everyone, I decided to re-run Bulletstorm the other day, downloaded the game in incentive, suffered a little with GFWL, but then a new problem befell me, an awfully fast camera rotation speed when aiming, I reduced the sensitivity to a minimum in the game settings, but it only affected the camera from the hip, while aiming the sensitivity has not changed, perhaps someone has come across a similar one and knows how to fix it, I would be very grateful for your help.