Try this.
based on what you are sayin , I feel this will work stronger for yoy.
The objective here is to only back a selection in your 8 race program that equats to the odds needed to break even or to make profit.
1
1
2
2
3
3
4
4

Unlike your original scenerio, the outlay is half, with a greater potential to profit with half thr outlay.

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Cheers.