I've found that it is useful to sand the inside of the track on the carbon masts when first rigging them. Often there are small daggs inside the track from the mould and/or there is a sharp corner on the inside back edge all the way up. Tidying this up helps the sail to slide up more easily and reduces the cutting on the luff tape. I us wet and dry 200 grade paper wrapped around a pencil inside the track.

Cheers
John Dowling
AUS 9