Nick.
I have not experience the 7766s separating, but I do make sure that the eye has closed right up when I join the rigs together, and I always test them by trying to twist them apart before I consider them ready to use.
Smithy.
I agree that the snelled rig is a good one as well, but I ahve found when fish are picky, they can pull the pilly off a snelled rig without hooking up. I agree on the use of fluro tubing and beads on my snapper rigs. I have not put tubing above the sinker, but regularly use it on the line that runs between the hooks in a snelled rig. Apart from being good as an attractant, it helps with ensuring big snapper dont bite through the line during the struggle after hookup.
Hope you are getting plenty of charters in despite the crappy weather.
cheers
Jeff