A friend of mine who is a professional fisherman/trapper uses cut bait (any fish) but he only uses pieces about the size of a fingernail, less than 1/2 inch square. He runs trot lines and outfishes ayone that I know.
Cut up skipjack is some of the best bait you can get and you can catch all you want below the dams when they are generating. Fish right in the boils with a three or four small jig setup and you will catch plenty of skipjacks. Sometimes I go and catch them just for the fun of it. If anyone wants some, let me know and I'll catch and freeze a bunch as there is no limit on how many you can keep. These will not be for sale, only be given away.
Last time out (two weeks ago) we were catching doubles, triples and quadruples. We'd rarely land any quads because the others would shake off while we were unhooking the first couple. But there were so many it didn't matter if we lost a half a dozen or more, we would always catch more.