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Better discard options than Distress: Inquisition of Kozilek, Blackmail.
Faster options for mana in this apparently 5-color deck: City of Brass.
Cheap one-sided graveyard hate that will steal you matches against decks like Living End: Faerie Macabre. They're playing it, why shouldn't you?
Better utility blocker: Reassembling Skeleton vs Augur of Skulls.
Duress is gold, keep it in. Despise is iffy, it's one of the first cards I'll side out. Consider Gitaxian Probe because it digs, gives you information, and lets you choose whether turn one Duress or Inquisition is better. I'm also slightly sketchy about Rotting Rats, but this deck probably likes to discard lands. I wonder how this deck interacts with Liliana of the Veil decks, particularly Aggro Loam.