I'd look at moving the Abrupt Decays to the main deck. The other missing removal is Thoughtseize. Detention Sphere and Supreme Verdict would wreck shop against this set up. I'd also do a full four Courser of Kruphix I play the full four and they are really awesome. Also not sure how well the Whip fits. Garruk could maybe be pretty good in this set up. Some possibly good sideboard cards are Mistcutter Hydra and Golgari Charm.
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I like how streamlined the deck is. It's biggest weakness is sweepers like Anger of the Gods, Drown in Sorrow, and even Detention Spheres. If you are using all the devotion from the Boros Reckoners and Ash Zealots why not throw in a couple of Nykthos, Shrine to Nyx so you can use a few Overloaded Mizzium Mortars or Storm Breath Dragon Monstrosity? Another neat trick might be a Chandra or 2 to control the mid-game. Oh and look up Possibility Storm, it might be a cool party trick for this deck.But I always like aggressive red decks.