the goal with all of these is to reach a level of uniform aim across most of the weapons / scopes so using multiple different values some what counteracts that
if you would prefer to set a lower value than 1.0 you can use the scaling feature to something lower
^ 70% would be 0,70 ads if i am not wrong
in the end of the day it is up to your own preference ( id keep a scaled number over 5 different numbers tho )