Hi Darky,
Have you considered doing 2 horse a race for the all-ups.

I feel ones SR will be boosted dramaticly.

Example.
If one is covering 2 horses per race.
2x2 = 4 unit O/L for the first race.
Split 60/40
60% on the lower priced & 40% on the greater price of the 2 horses.

Now all up the return on the next race also split 60/40

Cheers.

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Cheers.