I would say take out Distortion Strike; if you don't have Kiln Fiends on the field, it's absolutely useless. Also Call to Mind sort of screws with Pyromancer Ascension's workings as well as being fairly expensive. I would agree that Kiln Fiend is better than Chandra's Spitfire in this deck though; Chandra's triggers off noncombat damage while Kiln triggers off casting, which works better with blue. For extra control, and especially when your Pyromancer has ascended, I would recommend Melt Terrain. It's an incredibly useful card in almost any red deck, in my opinion, just be sure to include sideboarded alternatives in case you're going against something like a green ramp that renders it useless.
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Similar idea to what I had; just a few more combos and a bit less control in mine: http://www.mtgvault.com/ViewDeck.aspx?DeckID=104584
More Corpse Curs! Those things are amazing in any infect deck; get 2 or more of them in your hand and cycle them as much as you want. Warren Instigator is useless here as it's the only goblin card you even have in your deck. If you're going to run non-infect creatures in an infect deck, use some grafted exoskeletons. Strider Harnesses are also handy if you have room.
Sunblast Angel is a bad card for this deck; myr tap a lot. Magma pheonix is likewise going to do you more harm than good. I just really don't see much synergy in this deck; it's going to build slowly and up to very little.
Too many cards....weed some out, add more of others.
This was more or less to give myself a list of the best red tap creatures and just to see if there were actually enough...kinda a skeleton deck more so than anything else. Some possible additions would be infect equipment/spells, red burn, red land destruction, or black/blue control. There are some other better creatures if I were to make it black/red; I'll probably make those separate decks on the website, though. I'll provide a link whenever I get around to making them.
Also, check out this deck: http://www.mtgvault.com/ViewDeck.aspx?DeckID=104355
Id check out: Lightning bolt Vulshock Sorcerer Prodigal Pyromancer Fireball