Kyosho are offering Carbon fibre composite parts rather than carbon fibre (laminate), moulded basically, just like the main chassis.
I tried to get these to review but was unable to.
I will be getting hold of some actual carbon fibre (laminate) parts to review, they are not from kyosho though. I'll let you know more about them when they are in my hands.
After reading your post today, it might be just bad luck with the brace, but i went to a friend who is a hobby machinist, and he is working on an alloy brace right now, hopefully i will have it in time for this weekend to test, if he wants to make more of them i will pass on his details, if its too much work he might not want to though..