My experience with a carbon fork used for cross was a bad one. I was out practicing mounts, dismounts and other cross skills with a friend.
At one point, the both of us were riding up a small hill, and out handlebars connected.. we both fell.. we were not going fast at all..
his cx bike was fine, My redline cabon fork fractured approximately 5 inches above the dropout on the left side.
So, from this experience, I have replaced the fork with a steel one.. atleast, I know it will stand up to almost any
future mishaps..