The original poster said:
"However, considering my riding needs I wonder if I should look into specifically a steel bike instead of carbon. I have tennis elbow from my music hobby and sometimes carpal tunnel (I'm so glad for those Ergon grips)."
I know that a lot of people are going to recommend steel bikes - the "steel is real" belief is alive and well. But my personal experience differs.
I have a CrMo steel road bike with a steel fork. It is roughly equivalent to Surly bikes in quality. The bike has 23mm wide tires on it. I determined my personal "optimal" tire pressures by slowly increasing the psi in each tire until the vibration and jolts were definitely uncomfortable. I found that the highest pressures I can use are 72psi (front) & 96 psi (rear). Even at these lowish pressures, the bike is sometimes uncomfortable on really rough roads.
I also have a Specialized Ruby** carbon fiber bike that has a carbon fiber fork. It too has 23mm wide tires. I can easily and comfortably ride with 95 psi (front) & 115 psi (rear) on any road. Actually, I could increase the pressures even more, but I see no point in pushing it to the edge.
So based on my experience, the Ruby's carbon fiber frame and fork absorb so much more vibration and shock versus the steel bike that I can increase the tire inflation by 20% to 30% to achieve much lower rolling resistance and, at the same time, I enjoy a much smoother ride. Poorly designed carbon fiber frames and forks may not be able to achieve this level of comfort. But those bikes marketed as "road endurance" bikes probably should be as comfy (or nearly as comfy) as my Ruby.
(Note: ** The frame and fork both have "Zertz" inserts.)
JEAN
2011 Specialized Ruby Elite - carbon fiber go-fast bike
DiamondBack Expert - steel road bike
Klein Pinnacle - classic no-suspension aluminum MTB