Your logs look completely fine from my perspective, although you are using a few death strikes. rely on your healers and just remove it from your bars.
How do you improve from here? Irrelevant since prepatch inc, but anyway: Maximize your targets struck by howling blasts and defile, your defile seems a LITTLE bit low damage wise. Manage AMS runic absorbation as good as you can. Increase your damage input in 1st and 2nd ring pop. Your amounts of obliterates have changed from being too many to just about right. Less obliterates often equals more dps until you reach some kind of limit where you