Back when I played, max.
I always use max. It takes a learning curve, but once ya master it like said in replies above the advantages are considerably worth it in being able to consistently outmaneuver anyone. I still bully people in Star Wars battlefront 2 all the time with my max sensitivity just because they physically can’t keep up with my movements.
Oh, and by the way, don’t just go from whatever you have to max sensitivity, increase it by 3% or so every other round or so, as to make getting used to it much easier. That’s how I roll in any video game.
So, I guess just practice and keep upping your sensitivity gradually and eventually you’ll have no problem hitting your shots and outmaneuvering people.