You will not see the ratio with MDH 0% because it technically doesn't exist. 0% matches a tracking speed rather than a distance, so it doesn't make sense to express it in terms of a ratio.
In regards to first person to third person, if the conversions available doesn't work will for your preference the best way to go about it is to have one source for first person conversion, and another third person game for third person conversions. Mathematically there's no difference between the two, but they can feel very different depending on the game and your preference.