About story. I think that the weakness of a hero really is the exciting piece of a story. Weaknesseses can be a thing to overcome,to be chalanged, or where real curage is shown. Your definition is too much static in my oppinion.
The maximum of 5 dice I did’nt get this. However maybe I read it too quickly.

The karma thing threw me for a loop for a bit, but I think I understand how it works now. Players who roll worth crap, who would normally gripe, now have a chance to do something good with the roll, take it gracefully, and earn some karma. And characters who are totally outclassed but try anyway, plucky little guys, are rewarded, because they will probably keep their entire dice pool, as long as it’s under 5, but the GM can toss out the 1s in the resistance pool, giving the hero who faced defeat, disgrace or failure bravely a karma point or two.