the sliding stopper on the cab's powerline is supposed to be adjustable - there's a ratchetted ring that you can squeeze to adjust how tight the stopper grips the line, and therefore how much force is needed to push the bar away to depower.
great idea but, it doesn't work... the things are built so the ring can't be tightened enough to stop the bar sliding up when even lightly powered. apparently it's a liability issue... if it worked then cabrinha couldn't claim their kites come with 100% depower. i asked them.
Can you post a picture of the 11' setup....? interested to see what they changed...
I have been on my 2010 Cab for nearly a year and i dont have to much trouble with the stopper. It slides when it needs to slide and when i rest the bar on the stopper.. it holds (and thats only the second notch of the ratchet)