ok here we go:
ur gears good, the only thing u lack is a bit of hit/expertise (as u noted urself) u realy could search for a bit of that gear.
the spec im not realy crazy about some things i would change myself:
i would take away natural shapeshifter and master shapeshifter and put those points in 5/5 furor, 1/1 feral charge and 2/2 imp leader of the pack
i dont think the benefit of 4% physical dammage is that much, and i dont think i ever was short of mana as a tank.
feral charge is nice to have a quick react to save people (sort of like intervene), where the 4% heal on every crit takes a bit of load away from ur healers, the 5/5 furor is just a 100% chance, i wouldnt want to depend on a chance for that starting rage.
the 10 rage is instant agro.
hope this helps