Something to try are circle hooks size 4/0 particularly when drifting live bait, another trick is to change the tail hook on a Rapala or Halco to a chemically sharpened single on which I sometimes put another hook as sometimes they bite short.
I've also used plastic worm hooks as for bass, again straight shank and chemically sharpened, the longer shank allows better attachment of the sardine fillet.
The sardine fillet is tied on flesh side outwards as you do for shad or snoek in KZN. Chicken livers can be added as its the blood that initially attracts the fish.:fishn
I've had more success using bait runner type reels particularly when using sardine fillets as the tiger can bite quite softely and will pick up the bait and move off if they feel any resistance they drop the bait, so bait runners or open spools is the order of the day.
so good luck chaps, tight lines and screaming reels