I changed up the travelor setup and its working well. You can cleat and uncleat under pressure, and you can cleat the main out to the end of the travelor and not worry about the main "autogybing" when you dont want it to.
I like your traveller setup. I have a classic old school centered cleat and it's hard to manage from the wire, I feel that your system could be far better.
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 <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" />