There's much better authorities on skims than me on the forums mate, but for what it's worth the carbon prob can't hurt with the extra thrashing that kite would potentially do. I don't think the extra stiffness will worry you too much
wavezoneskim.comThese guys seem to use it on some of the higher spec models
post up what you're riding or thinking about riding... I've just ridden some kite brand skims, a wake surf and tried other random skates etc
all good fun to mix it up