Lisa,

Thanks for coming back to clarify your post.

A few thoughts:

You say that you "feel" you are loosing power, but do you KNOW you are loosing power? In other words is there a climb you ride regularly where you could actually time yourself on both bikes to see if the CF is making you slower???

It just reminds me when full suspension XC race- mountain bikes first came on the scene. Racers shunned them because they
felt slower. When timed on technical courses however, most racers were actually faster .

Perception is not always reality.

So lets say that you discover that your CF bike really IS causing you to be slower.

You might consider checking your wheelset. A flexy wheelset will make the whole bike feel flexy.

You also did not mention which CF bike you ride. Not all CF is created equally! There are some CF noodles out there, like the old bonded CF tubes.

The third thing I would be curious to know, is this a "new" problem with the bike, or have you noticed it from the beginning? If it is a new problem you need to check for cracking or damage to the bike (focus on the stress points at the headtube junction, around the BB, and inspect the seat/chainstays AND the fork).

Good luck!