Okay say we buy this. What is your list? It seems like this deck is almost like Anku Sligh. Do we play Raze over Shattering Spree?

I'm just wondering how strong gush was for you. It seems a little out of place.

As you say the Oath matchup is already tough so Dark Confident making that worse isn't that bad.

I'm more worried about you dropping tinker and jar for 2 tops. With Dark Confident taking up the spots of immediate draw spells I would think that you might be more reliant on a draw 7 mid-combo. The obvious flip side of the coin is that with Dark Confident hitting for 4 damage or so then a cheap storm count enhancer like a top might be wiser as well.

Regardless, I think your testing has already found Dark Confident to be useful.

Edit:
Have you tried using Chain of Vapour instead of Hurkyl's Recall or Rebuild?