If you have longitudinal wrinkles of carbon sticking out then you can sand them down without too much worry. After all what they principally represent is fibres that have been squeezed out as the laminate compresses down, so you can take them out without compromising strength or lay-up thickness. Horizontal wrinkles are trouble because if you sand them off you are breaking into the carbon at a single point, making a spectacular weak point. This is mainly a matter for very careful vacuum bagging. Glass is cheaper, heavier, and has less impact on the final bend characteristics.
Carbon is more expensive, lighter, and contributes more to stiffness, especially fore and aft.
Glue the track on with a reasonably strong filled epoxy mix, and then fair up the gap between tube and mast to your preferred shape with something a bit lighter. In New Zealand they take a different approach. They make their tracks from a rubber type caravan awning track which bends very easily but does not seem to lose the bolt rope out of it. This is glued onto the mast using a particularly flexible adhesive called Sikaflex. Take a good look at the end of the mast track where the sail feeds in.