I'm 6'2 and ride a 58 Dual comfortably. A larger size would have stretched me out too far. Our inseams are identical give or take a 1/4 inch. I don't know my precise measurements i.e. torso to sternal notch. If you are ordering a complete bike, you may want to make sure of you get the right stem length (if through a LBS they may swap it out for you). Great bike, good luck!

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"In the blocks you're a prisoner, the gun releases you."

I don't know about my torso measurement, but I am about the same height (~6')and have the same inseam and I ride a 56 Dual just fine. There is plenty of adjustability with the reversible seat post and even the carbon stryke arm pads. If you really need to address the torso length you may want to try a 130 stem, but my guess is you won't have to do so with a 56.

FYI I ride with the seat post forward.

P.S. I am just a guy on the internet, you might want to get an "expert guy on the internet" to chime in.