You typically don't use skills to grind but elemental melee. In fact I've never used a skill on my champion save for killing a boss. Get a decent altiverse weapon of your level range and compound attribute.
This is why I have the disclaimer saying the build is based off ele melee. I mean, skilling on a champion to kill run-of-the-mill mobs is the lolsiest thing to do, the CDs take 5ever.
Shockvibe is just eh. It only lowers AC and as it's percentage based it won't actually lower a monsters AC stat much since they have shit to begin with. Hence, it's why it's a PvP skill.