XFactorAiming is no longer in the config file, it is replaced by ADSMouseMultiplierUnit but it does the same thing; it sets the multiplier for all ADS. Each individual ADS sensitivity can only be configured using the ADSMouseSensitivity1x value etc, which only supports whole numbers and no decimals.
Either way, your discrepancy should only be a few tenths of a percent at most, so it's in practice insignificant.