1) Fending accessories are garbage. Nobody wants them (even tanks). People literally groan when they come out of loot crates. Your decision to focus on strict DPS checks means tanks prefer Slaying accessories over Fending accessories. You could make Vitality a damage-stat (similar to how Dexterity determines damage for Ninjas). This would make Fending accessories very desirable for tanks instead of a waste of time/loot. At this time, Fending accessories clog the loot table.

2) Parry is a junk stat that every progression-oriented tank does their best to avoid. You could change Parry so it does a small auto-attack / counter-attack when it procs. This would make Parry as desirable as stats like Critical Hit Rate and Determination.