I can solve your problem. Find a LBS who has some road bikes in stock. Test ride 55-58cm bikes. Find one you like and look up the specs. Compare these specs to your CC bike.

I did this and it's how I ended up on a 61cm Litespeed M1. For me the toss up was between 58 and 60. I didn't like the fit of the 56s at all, even though people my size do ride them (and smaller, even).