I was fit to a CAAD9 54 cm with all the spacers underneath and the stem flipped down. I've been having lower back trouble due to the fit and I'm going to take the bike back to the LBS and see what they have to say. Maybe flip the step back up, hopefully that'll help enough. I road a 56 before that, comfortably enough, with only shoulder pain on longer ride which was under control with just a little bit of stretching before and during the ride.

The shop thought my back looked better on the 54. Well, what now...