I'd add a bit of dry hops to the mix as well; CDAs/IBAs are generally known for their impressive hop aroma and flavor, which is balanced out by the roasted malts. That hoppiness will come from the late additions and dry hops; as-is, I think yours will be a bit overly malty for the style.
The carafa+chocolate combo will probably be a bit roasty for most tastes too, but since (I assume) you're simply steeping them, I think they should work well. If you'd prefer less roast, you should probably opt for Carafa special (dehusked), although I wouldn't worry about it, myself.
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