Hope you havent got it ?? (Hysterisis)
Anyway ; it was me that mentioned it and I agree I dont think it has any real effects in this case.Inernal damping differences between C and glass will be tiny. ( I would imagine)
I cant see how it woul be possible to build two masts of equal stiffness; equal weight ; one of 100%C and other 50% C (yet same reflex ???)
Lighter masts of equal stiffnes must have quicker reflex.
The equal weight lower carbon would be softer.
I just think for sails under around 8 metre 100% masts are too stiff (Unless they are RDM)