Rakdos Aggro Deck Questions

Hello everyone. I am gearing up for next FNM 2HG with a Rakdos Aggro deck to compliment my friend's werewolves deck. [Here] (http://tappedout.net/mtg-decks/rakdos-5-turn-aggro/) is my decklist so far.

I am trying to decide if I want to replace the Hellhole Flailers with Hellraiser Goblins in the interest of attempting to swing for lethal turn-4. The biggest problem I am having now is my 3 and 4 drops. Any advice would be welcome.