The difference? Flame + 7 server does 250 to King of abyss. Power within is 400... Red tearstone adds to around 750. Evil eye and server heal me for hits (server) and kills (evil eye).
The addition of damage multipliers, although damaging and risky, have it's uses. Of course, against Darkwraiths, that is not an option to use most times, but all other enemies have it to their death. Very powerful. Of course, the curved Greatswords are notorious for being slow in their swings, rivaled by the ultra swords and great blunts. Still, the stunning capability helps.