Halo 5 Controls and Sensitivity

So normally with Halo games my K/D ratio has been between 1.2 and 1.8. Not amazing but whatever. Now I played the beta for Halo 5 and i was killing it, but now that Halo 5 is out I cannot seem to get over the sensitivity in the game; I feel as if it is too slow. I feel as if I’m making progress with killing but only the BR is helping me out. Am I not used to the 60 fps, my controller, or new aiming system?