Is your lack of hit/expertise causing you trouble? Are you unable to hold threat or missing key things, like interrupts? If so, you should probably get more hit/expertise. For my part, I find I hold threat quite well already, but sometimes I miss my shield bashes, which frustrates me. I generally have good interrupts with me in the dps players I play with, so it's not too bad, otherwise I'd grab some hit/expertise. The basic answer to the question is "get hit/expertise if you need it, not because you need to hit some predefined cap."
Originally Posted by kumiho
2) should I also reforge avoidance to be hitting these caps if gemming and enchanting isn't enough?
The argument over EHP vs. Avoidance hasn't been settled yet. It's all good for you. People are leaning slightly more towards avoidance right now, but the fact is that you can reforge to avoidance and you can't reforge to stamina, so I'd still lean towards stam in sockets for now. I'm meeting all my socket colors for the moment as well. This will probably all change soon, as the theorycraft catches up with the new content.
3) after hitting those caps should I ignore straight stamp gems, even in blue sockets, for stam/avoidance or stam/mastery?
No time to look at your armory atm, sorry.
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