Boards that have a lot of carbon fiber are not always good to split. The reason is that the carbon fiber is a weave under tension, when you cut them it can alleviate the tension and the board may rebound. The carbon fiber is structural and when certain pressures are changed it may not hold its original shape. Understand?
I cut a board with carbon fiber topsheet and it "rebounded"; and the camber tripled! Needless to say it was a waste of a very nice board. YMMV
_________________ Talking about snowboarding is like dancing about architecture...