Tam if you have a selection yourself, say you like horse (5) for example you bet it this way:

5-Field-Field
Field-5-Field
Field-Field-5

I know it's expensive, but your selection should be 10/1 or better and you must be confident it can run a place.
I have seen huge results especially over the Spring Carnival....and on wet tracks in Winter!

Just an idea, don't take this as gospel as you may not have the bank to withstand a long series of outs.

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Treat your selection and staking methods not with optimism, nor with pessimism, but with realism.