The number 1 lure for that area is without doubt a 30g copper spoon, (either an original Effzett or a good copy) rigged with two single hooks, one on the top and one on the bottom. Replace the split rings as well with stronger ones. Use 6/0 singles, a short shank, wide gape one on the bottom and a longer shank hook on the top split ring. Use a piece of #5 piano wire of around 20 - 30cm long between the spoon and the line.
Allow the spoon to sink after casting and retrieve it slowly, keeping it deep. A faster retrieve will get you smaller fish, but the big ones will hit it moving slowly deep down. Even a very slow retrieve will work, as this spoon flutters with very little movement. Keep the rod tip pointed straight down the line, ready for the hit.