Just to add some clarity to the discussion on jasper chains:
-If you're chained ranged to ranged, don't break them ever
-If you're chained melee to melee, don't break them ever
-If you're chained ranged to melee - THEN break them during jasper overload.
There's really no reason to break chains on two people who are free to stand in the same spot, all it does is give a chance for new chains to spawn on them that are even worse.
It seems like that on ten man, that's for sure. By the time another jasper phase comes out, usually the entire raid is under chains and the jasper guardian is spamming Jasper chains. Could just be bad luck with the time between Jasper phases, though.
It's to the point where my RL and healers agreed and said: "Screw it, let's just deal with being chained".