Have you tried to add really thin pigtails to the blocks on the traveler? If you make them the same length as half a rail it would provide instant centering (pull until the block touch the cleat), reduce the amount of needed control line and most importantly remove the need for you to mark the middle with this ugly red tape on your nice looking carbon beam
Thats a neat idea. I like the system, but it needs bit more tuning to make it really slick.
