Thanks EBeast for replying :) I've updated the OP with your sets.
Though I've never used Klang, Fraxure is deadly. I've found he works well with Paralysis support from the likes of Probopass, in order to reduce the amount of threats that outspeed him.
Here is another discussion topic I thought of: Do NFEs have to use an Eviolite to be viable? As the item gives many the defenses they need to compete, it's often mandatory. However, are other items (eg. Choice Scarf, Life Orb, Focus Sash) equally viable?