No, I don't mean set 100% for ADS, set ADS to the calculated scope sensitivity. Those numbers are interchangeable, but will only be correct for the scope you are converting to.
So if you for instance want to convert from PUBG to Nyne, do like this (all values are just examples):
Now it doesn't matter if you set ADS to 100% and 3.4X to 26.71%, or ADS to 26.71% and 3.4X to 100%, the result will be the same.