wpf doesnt count that much.
its more comfy with high wpf, but you can go with 1 and then you have less chance to make faults.
you win a duel (in normal case) when your enemy makes some fault, we all are humans.
if you make fatal fault(s) earlier, then you loose.
wpf adds a bit damage also, but Power Strike is more vital to damage.
if you got high wpf you can make much complex feints (of course, not wpf is the only that you need for them)
these things smell like facts.