[skidlids]

Adjusting the span is just that, making the span fit your hand, if its closer to the bar its easier for you to pull, but doesn't change the amount of fluid you move, that is the same amount of mm travelled by the lever moves the Piston by the same amount as before say you pulled the lever in by 20mm the piston will have moved 4mm no matter where the span is set.

Magura quote a lever ratio of 1 to 5 for the 195 range (the one you have)
and they quote 1 to 7.2 for their 190 range of Radial Mastercylinders.

Brembo figures refer to Piston Diameter and Pivot point position

Had a little look earlier and among my Jap bike mastercylinders I have
3 X Nissin Radials all 3/4" piston size and all remote reservoir (Honda and Suzuki)
1 X Nissin Axial with 1/2" piston size and Remote reservoir (From a Honda)
1 X Nissin Axial with 5/8" piston size and Integral reservoir (From a Honda)

I should have a couple more out in the workshop as its not that long ago I upgraded the one on the R6 from a Axial to Radial caliper