Hi all,
I am 5'7" (170cm) with 32" inseam (81cm) and I think I have the same problem (short torso - long legs). I also have the same bike (CAAD). I ride a 52, should I have gone for the 50???
The CAADs are relatively low bikes, meaning that the head tube is short and the handlebar on the low side. The ideal bike for you would be the opposite - a bike with a tall head tube for its size. That allows you to buy a bike with an appropriately short top tube but still have the handlebars high enough.