What OP meant was volumetric flow, not the extrusion multiplier. Volumetric flow caps the volume of plastic the slicer will ask your extruder to deliver per second. Fiddling with this value can help prevent under extrusion.
What you did by reducing speed is similar, but you could run into issues if you were to modify extrusion width or layer height.












The stock 350mm Voron bed is 5/16" (8mm) thick. It’s quite hefty lol