Ocelot the first list I theorycrafted for Origins was an izzet deck that aimed to be somewhere between control and aggro. While I think you can make an aggro deck with control elements or a control deck with a fast clock, I think it is important to have a consistent strategy and stick to it.
Izzet will never be as fast as mono W or mono R aggro, so you do have to play control in certain matchups. But twinbolt is just devastating to decks that rely on a lot of 1 toughness creatures. The answer to this sort of matchup is to play differently rather than include a ton of defensive cards like arsonist and perilous myrs.
Izzet isn't built for the late game. You don't have enchantment removal to deal with things like
Evolutionary Leap,
Thopter Spy Network,
Sphinx's Tutelage etc. Some of the cards you run do not have much value until the late game, like ravaging blaze and inspiration.
On the other hand, if you do want to go for more of a control route you need more finishers. The planeswalkers are decent but you could also throw in a few more cards.
Disciple of the Ring would be very good here, I opted for
Soulblade Djinn because I like the evasion and team pump. Mage ring bullies are not great in a slower build IMO.
I just posted my list so I won't go into more detail about individual card choices. I do think this is a fun archetype to play with.