Heres a technique you might like to have a go at.
Target the 1st & 2nd Market Fav.

These have a statistal SR of apprtox 50%

Reverse Dutch book on the 2 selection
Horse A is say $3.00 divided into $10 = $3.33
Horse B is say $6.00 divided into $10 = $1.66

Now reverse the amounts for each horse.
Bet $3.33 on Horse B if it wins, we get back $19.98
Bet $1.66 on Horse A if it wins, we get back $4.98
Total O/L $4.99

If Horse C gets up , we ill have the equivalent div of $3.99 for our O/L
As opposed to $3.00 for our O/L thats a 33% increase .

I feel one's returns will be stronger long term doing it this way.

If you feel you deserve even greater returns, target the 1st & 3rd favs.
It takes patience to use this idea , especially when one sees the Favs getting up all day, but it usually pays off with just one good div.

SR for 1st fav is 30% , 2nd Fav 20% , 3rd Fav 15%

Cheers.

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Cheers.