Well to solve some of the top decking problem , you can include green sun zenith but that entails allowing the game to go long enough to do swarmlord cmc + 1
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viridian corrupter does a nice job of shoring up your weakness to mortar pod and cunning spark mage, but your always going to be vulnerable to low many cost removal due to the nature of infect creatures. To be honest, make them waste mana blowing away your blighted mages and hit them for a couple poison counters and put pressure on. I'd probably say mid-game infect with viral drake and maybe ... maybe even phyrexian swarmlord. I intend on trying the swarmlord myself and pushing my aggro more toward control, atleast for my local meta.
Ok , so this deck is going to run into the same trouble that my current standard deck has been running into. You can hope for that turn 2 win, or turn three but to be honest, if the local meta is playing 1 cmc removal/bounce, your going to lose momentum going in for the kill. I often see wasted pump because my opponent brings out a mortar pod or a cunning spark mage and against your deck , you have no other creature to fall back on. CAW blade doesn't mind sacrificing a hawk to use mortar pod against you and some variants at my shop splash red for cunning sparkmage or touching in the exarch combo. Just a heads up, but it might be in your best interest to add a few creatures with toughness greater than 1. To be honest, this kind of a deck(including my current standard deck), peters out against a decent control draw or spot removal decks like vampires, k-red and splash variants of other mainline decks.