im pretty sure I cant just use2 poles of a 3pole contactor!?

I think you're getting confused with a starter fitted with an overload that has singlephasing prevention. In that case, leaving one pole unused* will cause it to trip, as it sees an imbalance. But the contactor is just a beefed-up relay, you can use as much or as little of it as you like.

*The solution to this one is to feed the line through two poles in series.
 

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40A single phase contactor + timer motor control
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Electrical Wiring, Theories and Regulations
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pbarrett,
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Lucien Nunes,
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