I had the exact same problem. I was playing with my monk friend and I died too many times with the spec and gear which were very similar to yours.
So I changed to tank spec (yea you think you should dps when you have a tank friend, but it is better to survive and do continuous damage than running back all the time just to be killed again)
After having 1300 LOH, 40k hp, 400resist, 22k dps, I felt a big difference (I can survive longer than my monk friend! ) and we are currently farming early part of act3 now.
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So I changed to tank spec (yea you think you should dps when you have a tank friend, but it is better to survive and do continuous damage than running back all the time just to be killed again)
Here is the link of the tank spec and gear that I followed:
http://www.youtube.com/watch?v=3kBLJQuIEyY&feature=youtu.be
After having 1300 LOH, 40k hp, 400resist, 22k dps, I felt a big difference (I can survive longer than my monk friend! ) and we are currently farming early part of act3 now.