Can be difficult especially at this time of the year.
If you're not fishing pegged then fish to the left toward the dam wall or go to the right just before the 2nd Bluegums from the end.
One rod fished at 90m with floatie dough on one hook and dough on the other. Flavours that always work are
Perdeby and FX
Terminator or Dynamite
Banjo and Cina 1
The other rod i would make a Vaaldam Trace with 0ne hook a Juana Floatie and dough backing and the other 2 worms and dough backing. Throw it as far as possible and wait.
I've fished the dam often this time of the year during many National trials and these combinations have always worked.
The big fish come out on the long line and weigh fish on the 90-110m during a club comp or 110-130m during trials as the fish are then extremely pressured for 3 days.