Anyone ever played Soul Sisters (boros Edition) competitively?

I made a R/W Norin the Wary Soul sisters deck. It look amazing on paper and does well against MOST match-ups but lately I feel myself questioning the decks ability. I THINK i'm playing to the best of my ability but I find myself unable to really answer the opponent fast enough when i'm up against tokens or aggressive mirror matches. My sideboard I feel is solid but hey if anyone has played this deck in a serious setting, please tell me if i'm missing something.

THE DECK : http://deckbox.org/sets/623617