I completely agree. The Titan is much more functional and a lot easier to cast. Maybe drop 2 Karns and throw in two Shrine of Burning Rage?
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The changes you made definitely turned this deck into a real force to be reckoned with. Myr Galvanizer + Voltaic Key + Myr Turbine + Myr Battlesphere can get you an army of Myr out onto the field. Really the only thing you have to fear are Phyrexian Rebirth, and Creeping Corrosion.
This is a really cool deck! Have you thought of maybe including a Voltaic Key or two in there? For only (1),(T), it can allow you to re-use your turbine, or untap something for blocking. It would also work well with the previous Steel Overseer suggestion.