As far as OEM springs, the P12 single springs are actually stiffer than the P11 dual setup, if I recall correctly.
It is also possible to convert to the P11 dual setup, as long as one uses the all the valve parts from the P11 head.
I am in the middle of installing springs and retainers in my VE right now.
I dread the day when the 20V plug cover will get scratched. Does anyone know a color match for the red lettering?