Since I already wrote that K/Wl needs changes to become viable again, here are some concrete ideas. The class currently suffers from three major problems imho: (general) lack of damage, no "real" rotation (Unholy Strike & Punishment + Warp Charge/Weakening Weave Curse) & being almost permanently out of focus.
First off, please consider changing the calculation of Charge and the second hit of Shock (the one dependant on the amount of Holy Seals on the target) to mainhand weapon dps light damage.
K/Wl specific:
-Change Strike of Punishment: "Can only be used while your target is under the effect of Punishment Seal. Deals 1500% mainhand weapon dps dark damage to the target and restores 50 Focus."
-> Currently this skill is never used because it's not dps based. Moreover, this suggestion would easen the constant thirst for focus the class suffers from. 1500% may seems high, but don't forget that the class has way less weapon damage than /Wd, a class that doesn't overperform in any shape or form.
-Add to Shield of Darkness: "Your Truth Shield Bash increases your light damage and dark damage by 12% for 60 seconds while under the effect of Shield of Darkness."
-> K/Wl lacks in terms of damage increments compared to /Wd and currently Truth Shield bash is never used, because it deals less damage than Unholy Strike.
-Let Psychic Sweep enhance Surge of Malice as well: "Inflicts 400% mainhand weapon dps dark damage to up to 10 targets."
-> another "new" skill to use & some additional AoE
-Change Defensive Mastery to Master of Seals: "Enhances your Holy Seal greatly." -> Holy Seal: "Deals 600% mainhand weapon dps light damage and 600% mainhand weapon dps." 6 seconds cd instead of 10.
-> Since K/Wl seems to be dps focused I don't see why the class needs another pdef buff. This way Holy Seal could be included into the rotation and would deal slightly more damage than a Unholy Strike (538% x2).