I'm in the process of gearing up my second tank and I can tell you, having tried three different gemming styles, that stam stacking is indeed the way to go.
Gemming avoidance:
You don't gain much compared to the stam you could be getting. Especially at higher gear levels, you're already hitting DRs on dodge and parry so the value of gemmed avoidance goes down even more. Stamina has no diminishing returns.
Gemming for threat (hitcap/str/expcap/etc)
A lot of people outline the current situation of threat as "I don't have to outrun the bear, I just have to outrun you." You only need to do threat equal to your highest TPS-producing DPS class plus one. Proper glyphs, talents, and use of abilities will do this, gemming is wasteful overkill.
Gemming stamina:
No diminishing returns. Always active. Always relevant. Always increases your survivability.
Does this help?

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