Try this.

1)Only target races where every runner has had 8 career starts or more.(We are hoping their career results mean something although their previous one or two starts may have been ordinary)

2)Pick 2-3 horses to beat the paper pre-post favorite.
You will be amazed how many times the overated favs. get rolled in these sort of races, with some big payers.

3)If there are any runners with less than 8 career starts in this field. No bet that race.

4)No more than 13 runners.

You will end up with approx.3 qualifying races in every 8 races.

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Cheers.