I always use the lightest jig i can get away with in the fishing conditions, whether it be walleye, bluegill, or bass. I have always felt that the fish can't resist the slow fall. It kinda stinks because you have to fish slowly, but if they are biting it does the trick.
Just last week i was casting a tiny ice fishing jig on a 9 ft. ultra light rod and micro reel to gills in about 5 feet of water and they would almost always hit it on the fall.