I've had decent luck with this:
http://deckbox.org/sets/457569?v=v
It's technically legacy as it's built now, but you could make a few changes and get it modern playable. Many people will argue that Simian Spirit Guide doesn't belong in this type of deck, but I've found the extra speed boost to be worth it.
Consider the vortex already mentioned and possibly Anarchy for the sideboard as a way to get around Ivory Mask type effects and it's generally good against white decks.
My favorite win with this deck was turn 1 mountain, remove Simian Spirit Guide from the game drop kiln fiend. Opponent turn 1 played forest llanowar elves. I play Mountain (that I top decked I kept a 1 land hand), Lightning Bolt to the elf, Assault Strobe on Kiln Fiend, remove spirit guide in my hand from the game to cast a second Assault Strobe. My opponent laughing says, "You can't give it double-double strike." Me "I don't need to, it gets +3/+0 for each instant or sorcery I cast. I attack for 20 (a 10/2 double strike)".
Note that this is not typical, but turn 2 wins do happen.
edit:
After looking at your deck, I would remove Goblin Fireslinger. He's too slow even if he does interact well with Chandra's Spitfire. I'd also remove Incendiary and Mugging. Add more Lightning Bolts and Lava Spikes. Guttersnipe works well with anything that also draws you a card (such as Manamorphose), otherwise you may want to consider something more immediately aggressive. Also if you don't have the Lava Spikes and the Lightning Bolts consider Flame Slash. Even at sorcery speed 4 damage still kills a lot of threats.
Red decks like this need to hit hard and fast. Look for the burn spells that are the most efficient or that you can re-use. Spells with Flashback or Unearth will help you reach the final points of damage. Barbarian Ring is playable, it hurts you early, but it is colorless damage that can be just enough to end the game later on. Hellspark Elemental unearths to hit a second time. Fireblast can get those final points of damage in even when you're tapped out.