40-50m you will get your muddies, grass carp and smaller common carp. I mainly use sliding rietvlei trace. I would use a floatie on the one hook and a small sweet white dough on the other. I have been having a lot of success with the Bleeding Floaties from MG (Vampire & Bunspice, Caramel and Plain White) Mainly sweet dips such as FX, Petite Janine Red, Dusk to Dawn, Vyfspoed - and this depth fished more in the morning till 10h00. You can use a little "potents" such as Devils Fork or Stuttaford on the Bom as well if it is a bit quiet. I only use the potents if it is very cold or if there are few bites - you must use this in moderation.
80-120m you will get some bigger grass carp, muddies and common carp. I would use pretty much the same baits as the 40-50m rods but I would feed the 80-120m with boms when I start fishing in the morning so that it is "operating" by the time you start to fish it at 10h00.
These are only my opinions - I hope you catch some fish.
PS: Boschkop will be full up I am sure - you will most likely battle to find a decent spot.