I would go with a floating line with a long leader. I would also go with small flies.
Small as in size 10 nymphs, dragons and damsels. Look at Flymphs, Soft Hackles, GRHE, etc.
When it's cold they just lie around, but when you do pull a small pattern like this it will not be ignored as they do take insects and naturals. The Vaal is full of Damsels and Dragons and these could be invaluable to you.
Go for a figure of 8 retrieve and if you think you are going too slow, then slow it down some more.
You would be pleasantly surprised to see how they hit the fly. Usually what happens is that the takes aren't hard, you just feel a weight at the end of the line and if you lift the rod it will go bezerk almost like a E.F.F. supporter being chased off with rubber bullets after an illegal land invasion.
You could even fish a small strike indicator. Another option would be to use a mega float(large rugby ball shaped float with the toothpick) and fish something like a bucktail jig underneath it. Twitch the float and the jig will start moving under it. Watch that float at all times. I would even tie a smaller fly below the jig as in NZ/Truck and Trailer Style.
If you are fishing towards the bank then I would go for something like a crayfish imitation. Drop it, let it sink. Twitch it, leave it, twitch it again, leave it and twitch again. They usually hit it when you pause.
Here is one that fell to a Flymph at Renosterkop...
This day out at Rust De Winter was freezing cold, but the same fly produced....
All the usual suspects did not produce. I was fishing from the bank and I would cast and let the flies go down. Then I would start retrieving and as soon as the flies came close to the weedbeds there would be a weight at the end of the line. I had fish break me clean off, others would jump and toss the fly. I fished a long leader, probably 20-30ft as that was all I could do seeing that I only had a floater on me. All you need is a heavy nymph or jig and a smaller/ Unweighted fly as your point. Take a 5wt and have some fun.
My tip for cold and over fished water would be go slow and small.
Now go and fish and come and tell us how you made the Bass guys eat some humble pie.
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