Trying to understand sensitivity

Can anyone here explain the whole Aiming Curvature thing? I get what a linear and exponential ramp is for a stick but I can not for the life of my figure out a good balance for snappy hip fire and controlled scoping.

I'm much better at fps than this game is letting me be. I played a ton of PUBG back in the day so I'm used to the system but even after looking up YouTube videos and going to aim training servers and rotting my brain on kumtown (amazing name by the way) pvp I'm just like a giant potato fight and sometimes I have a scope on it.

How do y'all get your sticks right?