Hi Benny,
I find Dutching to Return a fixed amount is the stronger way to go.
This is done by dividing the Horses price into a Fixed return amount of say $50

It controls the outlays more when there is varying numbers of horses being targeted race to race.
It also protects from overloading a race to show a profit, one tends to lose a lot less if it falls over on the shorter priced Dutchings.

Example.
Price
3.00 into 50.00 O/L 17.00 Ret 51.00 Prof 13.00
4.00 into 50.00 O/L 13.00 Ret 52.00 Prof 14.00
6.00 into 50.00 O/L 8.00 Ret 48.00 Prof 10.00
Total O/L 38.00

See Ozracetools for Dutching to Return, alternative to Dutching to Profit per race.

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Cheers.