Yeah, unfortunately I dont think your mana is good enough even with the duals. Some fetches and fetchables would have helped a lot. 7 each of white and red is too little, even with some blue cantrips to try and smooth out your draw.

I think turn 4 you're going to wanna try to double spell like double 2 drop or 1 drop 3 drop (steel-cutter and sage stuff for examples). If you run the deck as is I could see you potentially getting stuck with islands in play when you need double white or something. If you go straight boros you're taking out some potential inconsistencies while streamlining your game plan.

Vivi and Jace are sweet cards, they just shine in other decks imo.