I've had this on the back burner for a while (sadly, making a living takes up my time lately).
Joe is right, the FP isn't a one part solution.
1st - You have to make sure that the barrel is location properly, so that the bolt impacts the slide, not the chamber end of the barrel.
2nd - Extended Firing Pin (for experimentation, it would be nice to have the same lengths but one standard weight and another lightened version.)
3rd - Reduced power firing pin spring
4th - (possibly) heavier hammer itself
It'll have to be a package deal.
I really wish I had time to mess with this...