Just looking at your armory;
DK's generally aim for 7.5% expertise (because Death Strike can't be parried.)
Everything over 7.5% isn't completely wasted, but no longer helps your mitigation/survivability.
You might wanna swap Rook's unlucky talisman for something else (It's on-use is really only useful for a couple of fights. Like Malkorok or Iron Juggernaut with the frontal cone damage.) Though tank trinkets are kind of balls this time around.