Ok I am going to be the other side and say even doing the perfect rotation etc you are going to have threat issues in ICC using http://www.wowhead.com/item=37401 with any sort of geared dps.
If you cant get http://www.wowhead.com/item=50268 from H-POS grab a DPS weapon you are at 557 def and don't need +def as much as you need threat and whack mongoose on whatever you end up using.
I would even go with http://www.wowhead.com/item=47661 over the dodge libram given your position ATM you probably have it for your ret spec.
At the moment you also have no chant on shoulders or shield both of which have +def options if you really need to cover otherwise go with stam chants.
** Remember Warcraft players fail in directions you never thought possible.