Ive been using large softbaits and 1/4 oz jigheads for the last two seasons and they work well especially at night with a lumo bead.
I got the idea after i started softbaiting the canals. Just increased the size of my jighook/heads and used a 5-6″ softbait.
Last year i took 16 salmon from the hole under the rangitata bridge
Other anglers were spinning with spoons and zeddies not having any luck except first thing in the morning and just before dark.
I was managing to catch them during the day too
I use a trout reel tica stacked with 250m of 10lb braid and a 20lb leader. (not flurocarbon) i have caught salmon with jigheads tied directly to the braid so lm sure if you pissthem off enough youl gettem.
Upstream cast hit the bottom and jig half wind jig etc.
If you no theres fish there and you cant get them dont try and try and try give the water or hole a break for half an hour.
When water is clear use dark colors
When water is dirty shiny bright colors.
Pressure on keep it on and have fun doing it