I am currently playing on a stam sorc. I have hurricane, elemental blockade, overwhelming surge, and cleave from the 2H tree. Skoria will proc maybe one time then bug out. It will constantly fire like it should. It will display the ring around the target then disappears. No meteor drop and no damage. It will not work again until I equip and unequip the set. Then it will proc once or twice again and repeat the same scenario I mentioned above. I tried to experiment a bit with it. The less I have going at once I found Skoria will proc and damage normally for a little bit longer but ultimately will go back to the same animation with no damage.