When redfin are schooled up, almost anything will get a result. TT Ghost Blades in Bloody Ghost colour, red Celta, red Mepps, and bronze Hogback with red wool are all good options. Mostly I use catch and release, but with redfin, being an introduced species, I am very happy to eat the catch. They are a great feed.
Lake Mulwala is an iconic waterway for both Murray Cod and Yellowbelly, and both are well worth pursuing whilst you are there. Kieffen's Reserve is a good place to start. If you have a boat target these fish amongst the structure. Oar-Gee Plow lures in either 60 or 75mm in Colour A, Colour GR, and Colour H, and Predatek Boomerang in sizes 65 and 80mm, in colours PT, and EJ, are my go to lures in these waters.