Di2 channelling sticks very well for me on glossy carbon. It's designed for skinny round cabling though, so I can see it peeling up if you to try to wedge figure 8 cable in.
I've found that the wire which supernova use on their lights is too thick to happily stick inside the di2 sheath causing it to come away from the frame.
Di2 channelling sticks very well for me on glossy carbon. It's designed for skinny round cabling though, so I can see it peeling up if you to try to wedge figure 8 cable in.