No the items are not updated in retrospect.
Snapshotting mythic rythm is nice. (wothf Assimilation or deadly reach strike from beyond).
Combination strike is not worth it imo. To many skill slots used for merely a +- 40 % dmg boost.
I'd go frost element with ltk. Super fast attack speed complements the 10% crit gem. With shard of hate and a pigsticker or azure's. Very fun build. (Cool visuals)