Maybe look at getting a Ti/Carbon bike a la
Seven 622 XX or
Holland Exogrid? I am sure there are others, but those come to mind...
Maybe not what you are looking for (100% CF?) but might be worth exploring....
I have a Seven (previous version of the XX) and it is super smooth...
If you are 6'2"+, there is a
Serotta Ottrott in the classifieds....