You have to do a lot of fiddling with the settings. Unfortunately it will never be as accurate as PC. Ignore people who treat aim assist the same as 76's ult. It's more accurately when your reticle comes a target it's like a bit sticky. Helpful sometimes, but there's been plenty of times I've been aiming at one person and someone passes in front of me so my camera focuses on them and not who I'm actually aiming for