So recently I’ve had two cromor bikes, one a schwinn prelude that was as small as I could comfortably go... maybe a 54-55? Running on semi aero campy rims laces to some suntour hubs. It was stiff and buzzy over rough patches. Traded it for a viner in size 59, and kept the wheel set. The viner accelerates just as quickly, but the ride is smoothed out.
Now, the difference between the two bikes I think actually comes down to the seat stays. The viner stays are pencil thin, where the schwinn were a bit larger diameter thru the entire length. The fork on the prelude was hi ten compared to the viners cromor, but sitting is where I notice the most difference, not in my hands.