There seems to be a misunderstanding here about the nature of a carbon beam in a structural situation. It is not absolutely rigid, but rather flexes a very predictable amount under a given stress. And as it flexes it increases its resistance to flexing further. Wood is similar in this way, but a carbon beam is stiffer than any wood I am aware of, and has another very important quality: it remembers its original form better than any wood. It does not take a set, but maintains its original baseline. The point is, once the wood itself has taken whatever set it will, the carbon retains its form for a very long time. Once the geometry of the neck, in our case, has been adjusted to be as close to ideal as possible under tension, it will tend to remain so as long as there are no changes in the equation.
The role of the wood is also important, as it ever was. Dry, stable, clear, grain aligned Honduran mahogany is what is what am. There are other possibilities, but nothing is actually better. This is for similar reasons to the carbon reinforcement: it is predictable and reliable.
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