Try Ozracetools
Target betting program.

ozracetools.com/index.php

Set it to win say 3 units a race plus recover losses with a $900 bank.

Divisor in the expected div column goes like this, in lots of 2, on a string of outs...
$2.50,2.50,$3.00,3.00,3.50,3.50,4.00,4.00,4.50,4.5 0,5.00,5.00,5.50 ect

Reduce to previous divisor ,once a placegetter is struck.
e.g. $2.50L 2.50L 3.00L 3.00L 3.50p 3.00p 2.50L 2.50L 3.00p 2.50p Ect.
It will automaticaly reset itself once 3+ units in front.

One will see that it will usually show a profit on any resonable set of selections. If one is striking some reasonable divs along the way.
If it falls over , maybe the bank has to be made larger.

Another plan is to simply....

Go up the Ladder 123456789ect Win, Loose or Draw until crushing it into profit , hoping that one does not strike 20 looses in a row.
Bank needed $1:913 for a run of 40
Going up the ladder ,regardless of result, then start again as soon as any profit is made.

Let us know which one works best for you , after checking it against some of your past results.

Cheers.

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Cheers.