Converting Siege to other games, when using alternate multiplier.

In Siege, I use an alternate multiplier from what is default. I use 0.002230, rather than 0.02. I'm having a difficult time with the calculator specifically with games like CS and Apex. When I use the calculator to convert it doesn't feel in game like I'm doing things properly. In CS especially; the calculator suggests that I alter my CS FOV debug setting which it says isn't allowed without activating cheats I would also appreciate if someone could clarify this.

Siege Settings: V/H : 84, ADS: 65, DPI: 400, Mult.: 0.002230, 24 in. Monitor. 1920 x 1080, 90 FOV, 4:3 aspect ratio.

Please ask questions if necessary, thanks for the help in advance.