For QCQ you really just have to focus on not letting the target get directly behind you and using strafing in combination with a controlled turn versus a quick swipe to dominate up close.
Can’t do much about the turn speed in halo cause they cap it at a certain point. All the halos have had this problem. Just make sure ur 10/10 on ur sense and deadzone to 12-0-0.
Are the look thumbstick and move thumbstick both set to 12,0,0