What exactly is the issue here? I tested it now to be sure, and the calculations are spot on. The only issue is that the slider is not accurate so you are not able to set the exact value you want.
The config file does not register more decimals than in-game, so only in-game is added.
Also, typos in the scope sensitivity names are from the game, not from me
This happens because the game has a bug where it rounds the FOV to the nearest whole number before calculating the ADS sensitivity. So use the values from the calculator as it accounts for this.
I think you need a Chinese phone number to register and play this game, I got to borrow an account last time I analyzed it. So need someone to share their login and maybe SMS authentication to be able to add it.
This is mentioned in the game notes for the in-game calculation:
When you set the sensitivity in-game the slider will seemingly revert to a fixed value when you go back into the menu, but the sensitivity you set is applied.