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Before you comment on not having any creatures for finishing the game, notice the lands: Celestial Colonnade and Creeping Tar Pit. Consecrated Sphinx + Jace Beleren = Massive Draw. Inquisition of Kozilek + Duress for discard. DOJ for Mass Removal and Go for the Throat and Doom Blade for point removal. Cancel and Mana Leak for counterspell. Wall of Denial for a little survial when the game starts. Ratchet Bomb against Planeswalker or token decks.
Also, you might want to cut the 3 Wall of Frost for either 1 more Wall of Omens and 2 Baneslayer Angel , or if you don't have the Angels, try 2 Sea Gate Oracle . Against an aggro deck, you're going to need that early game defense, or the late game life gain, depending on your budget.
You could definitely take out 1 Ratchet Bomb and 1 Go for the Throat for 2 Sun Titan . Considering his recursive ability, you won't necessarily need that 3rd R. Bomb. Also, GftT gets alot worse when against a deck with mostly artifact creatures as their win cons, i.e. a Tezzeret Control-esque deck. Also, it makes sideboarding easier against said control deck when you just swap them out for the 3 Duress in your SB.
Lastly, you may want to consider running some Tectonic Edge s, depending upon what environment you play in, as they're a really good land. Perhaps: -1 Plains , -3 Halimar Depths for 2 Tectonic Edge and 2 Island . You want those early, guaranteed, EtB untapped blue sources to get consistent Mana Leak mana early game. Whereas the only early white card you have is Wall of Omens , and that isn't THAT important; depending on what you're playing against, of course.
I am going to take out 1 Ratchet Bomb and 1 Go for the Throat for the Sun Titan as you suggested and i like Tectonic Edge s but i don't play against many decks with non basic lands, so i don't think i will put them in. I am going to cut out the Halimar Depths for 2 Island and 1 Swamp to make sure i will have the mana for an early Mana Leak or Inquisition of Kozilek .