All Monitor Distances do this, but to different points on the monitor. MDH 0% is the same tracking speed, MDV 239% is the same distance to the edge of the 21:9 monitor. So it depends on what you want to achieve.
There is no multiplier option because the multipliers are unique for the games the have them, so for the auto function you have to use a standard measurement. Apex is using hdeg 4:3 as a base yes, but the in-game value is not correct other than at 70, and the config file value is a direct multiplier of 70. So both of them are in reality multipliers.
Those are correct for achieving MDV 239%. It's a bit easier in MW2 as you can just set the coefficient instead of each scope.
As for your old values, I don't know how old they are but there's a bug in Apex when it calculates ADS sensitivity which wasn't reflected in the calculator before, but it is now.