Well like the title says I'm getting a 1%+ dps result using NT over Frost bomb.
I'm not sure why this difference has only appeared in the latest build. Its either a bug or the bomb buff has changed things more than I thought.
In my gear the difference is tiny (0.02%) but in 522 BiS its 1.3% and in 535 BiS its 1.01%.
If someone else wants to confirm this or has any idea if its just a bug please do.