i thought riot blade potency is 100? (reason i don't include combo potency, is because I wouldn't ever do a fracture after a fast blade).

anyway- i use fracture too, but only when I do a fight or flight + Blood bath + Circle of Scorn, and have no combo open. If there was anything better, I would replace fracture first, but in all honesty, there aren't many good choices. Heck, I use mercy stroke... because well... there isn't much to choose from...