I feel the 60/40 split rather than 50/50 will answer most of your concerns where 2 horses are to be bet .
Because most of ones winners will come from the lower of the 2 priced horses.


You might like to try this approach.

Betting 3 horses a race.

To be used where at least one of the selections is $8.00+

Bet 2+1+1

In Price order.

It can work well.

I feel its an idea not to load short priced horses too much when multi-betting , use them more as a saver to cover some of the greater paying chances.

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Cheers.