As far as my personal testing goes, the problems with aiming are not related to the sensitivity are generated by the aim assist that is way lower than in past games.
Use the.same sens you used in past games but go to TMCC and play h1 or h2 with the no aim assist skull to get you used to low-nonexistent aim assist.
Use the.same sens you used in past games but go to TMCC and play h1 or h2 with the no aim assist skull to get you used to low-nonexistent aim assist.