I'm not talking about "bumps" I'm talking about road vibration.
Here's the white paper by Craig Calfee BacciagalupeYou can read through it at your leasure. He's an engineer I admittedly am not.
http://www.calfeedesign.com/tech-pap...l-white-paper/
I only have years of seat of the pants experience.

How many high end CF bikes have you ridden in ultra-distance events to make your observations**********?
You are correct that how the frame is designed makes a huge difference in how any bike rides but I think you are comparing apples and oranges. I'm not too sure about the inter-relationship between lateral stiffness and the materials vibration dampening abilities. I'm pretty sure they are two different things.