Heres is something you may like to try which has shown some intersting results.

Target one runner in every race that is paying $33
If not one available , take the next price down e.g. $32 ect. until one finds a selection.

I can almost guarantee to hit one or two winners within 30-35 bets.

Have a bank ratio of 1:250
Level stakes.

Cheers.

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Cheers.