Here's a way to stake the top CP selection.

Only target races where the whole field has has 2+ career starts.

Have a Base bet amount of say $10 per selection

Target the Neural price of the Top CP selection.

Divide this price into the next lowest CP price you can see.

Now multiply that figure by our Base amount.e.g $10.00

Example.
1st CP 2.50
2nd CP 3.90
3.90 / 2.50 = Our multiple is 1.56
1.56 x 10.00 = O/L $15.60 for this selection.

If one wished to only bet the 2nd CP selection .
We would divide 2.50 / 3.90 = .64
.64 x $10 (Base bet) = O/L 6.40

This way we are placing more on runners which have the stronger rating difference chance of getting up.

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Cheers.