Hi,
I would recommend, leaving the motion control as is and adjust the extrusion in the slicer (cam). Usually you have a reason, why u would like to apply a factor to extrusion. Slic3r and cura support extrusion factors on various conditions. Other slicers may have similar options. There are options related to filament (selected material) as well as model dependant options.
Enable expert settings and just dive into the options. For cura you first have to enable visibility of expert options in the settings.
Reinhard