This is going to be boring but had you done the following you would make a nice profit.

1. Check the betfair prices just before the jump for Harness and Racing on betfair.
2. If the betfair odds are $1.10 or less for the win you have a contender.
3. Check betfair place odds. If you can get $1.05 or higher then place the bet on the contender to place.
4. If you can't get $1.05 or higher then place the bet on NSW TAB as they have a minimum $1.04 return.
5. All up the selections for 20 wins with 30% of your bank bet.

Since August last year you would have had 45 selections with only 3 of these being placed on betfair at $1.05, $1.05 and $1.06. All others would have been placed at TAB for $1.04.

Assume bank is $1000 and you bet $300 for first bet you would have made $357 profit for first 2 selections. A profit of $484 for the second 20 selections and would be showing a profit of $121 so far for the third series.

Over 7 months your bank would have grown 96%.

I expect 120%+ over a year will be achiveable in good years and only around 50% in years where you hit a couple of losers.