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's to the point where my RL and healers agreed and said: "Screw it, let's just deal with being chained".