As for baits, small soft float with SWD, and single mielie pips worked for me. When I was there I was catching them on just about anything I threw at them. I was eventually fishing plain with no dips and still getting fish. But from past experience at Harties I have alway found the following to work there, Almond, Banjo, Triple D, Dusk and Dawn, Rose, Bunspice or Perdeby, and Q35. Always been my go to flavours for Harties. As for mielie pips, almond and Banana have always produced the goods!
As for your lielie bomb, each guy has his own preference, but I have always and will continue to keeping using plain Super Cast.
Here's Ifafi Aquatic clubs web site for more info : http://ifafiaquaticclub.co.za/