I gave you three examples of when a monk can tank. I cannot help you beyond that if you are unable to think outside the box.
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But in those cases - where you're burning down an add that the tanks can't afford to turn to - you should have enmity just from smacking them anyway. 100 Potency is horrible too, may as well just do more damage (and get enmity from that anyway). It really is a waste of a cross class skill.
Good thing monks don't have positional attacks. Also good that when things are chasing ranged around we still do damage just like normal. If you think you can produce more threat with a 130 potency attack then go for it and I will continue being a moron with total control of adds. Not having bloodbath really hurts so there is that as well.
The thing is we generate so much hate we wind up top in enmity anyways just from our damage alone, Sunder isnt really necessary except in maybe lower level content to pick up some slack if your tank leaves or dcs. Otherwise though proceeding through normal rotations puts you pretty high in enmity. Theres really no reason to ever take sunder.