I recently upgraded to a new bike (Tarmac 2019) and got a size 58. I also got a bike fit by a local fitter. When we finished the fit there were a few tweaks including moving the saddle up several cm (74cm total) removing all but a 1cm spacer under the 110mm stem and moving the seat about .5cm forward.
After the fit one of the comments he made was,"You're somewhere between a 56 and 58 with this model frame."
For some reason this has haunted me. I know the reasoning for "downsizing" on a frame, you can get more aero and the frame is lighter. But should I actually worry about this? All the reading I've done says that it would be too big if was swapping out the stem for a 90mm or having to get a seatpost without an offset which I didn't need to do. Any opinions or thoughts whether I should be concerned that the bike is too big are appreciated.