I think the ADS delay comes preset on bo4, different guns in that game has different ADS times, its been awhile since I've played that game but I think as long as your ADS delay is the same as the gun your using or more your fine or if its less your character goes through a weird animation to fill the gap which screws with your aim, as far as AA, that depends on how good you are with a mouse. go into a bot lobby, set a no time limit and try it out, AA on and AA off.