Rebuild. Need or not?

I already tried to play via Force Wave, and dont like this ability, it very bugged in game. Sometimes u saw, how it pass through enemy but damage not dealt. Plus it doesnt work when minimal landscape changes. Bone harvest works good.

Here. i found vitality-Cadence 2h DK build [1.1.8.1] Rattosh - 2H melee vitality Cadence Death Knight, SR 80+
But after your info, i already dont want to rebuild))

Kraken is musthave in most of 2h-builds?