Wow... only twice the weight of a good carbon frame!
Just sayin' - this is weight weenies!
When you have been riding as long as I have been you seem to know what you want out of a bike and the ride qualities that you are looking for. I could not find them in the light weight carbon bikes out there. I have test ridden over 30 bikes in the last year or 2 and still like the ride qualities of a quality custom TI frame. Built up it will be sub 15 pounds.
The most comfortable bike for me at 51 years old is gonna be different than yours. My 2007 bianchi 928 lugged carbon is a dream to ride and the geometry fits my body. I can still do 150 mile charity ride on that bike without issue.
By first real bike was in 1978. It was a 1978 Basso ascot with 7 speed DA,down tube shifters and mavic GP4 tubies and I raced that for 2 years. At 20# that was light for its time.