reducing parry to 0 yes.
But 30k damage from DC mobs not possible 
I got oneshotted some days ago as k/wl and got a 600k hit. Even if threaten is up, you should get around 200-300k from attack and even more from skills of mobs.
25% would be too less compared to now more tanky rogues and warriors, which also survive 1 hit with the new dmg mitigation skills they have (sure, it's probably only for 1 hit), but 25% would be too less.
You should also get in mind, that you can play the class with pure chain gear and don't know, but you would only have 200-300k HP ?:D the massive HP for your k/wl probably comes from protector stats, that are not best in slot