Hi Imaca,
If one is very confident of hitting one winner in every 8 races.
Just bet to price for a max of 8 outs, to win a fixed amount per race plus previous losses , this is called , due progressional staking .

If you dont wish to do this manually, there is a computerised version of this at Ozracetools under target betting, just tick the first of the 2 boxes shown .
Try & target .20-.40% of bank per race.
Just enter the horses Expected price into the column & away you go.

If 8 outs is struck , start afresh with a new lot, for 8 outs.

Its a strong idea to let any race go where the selection is not paying at least $2.80, otherwise the bets can get very high on a run of 8 outs in a row if all are very short priced.
You will be amazed at how many short priced horses get rolled, so try not to bet them.

This should keep ones bets more under control rather than a set total target as indicated with the 2nd box shown in the Ozrace program.

Its also a strong idea to use say Betfair prices rather than TAB prices because the price can be locked in & Betfair is usually 1-3pts better on the shorter priced horses.
e.g. Why accept a $2.80TAB price when $4.20 is being offered by Betfair.
One can multiply the Betfair price by .95 so as to work the net div being offered.
e.g. $4.20 x .95 = $3.99 (net div figure after commission.)

I am always amazed at the massive price difference with say the TAB Fav
1 min till jump compared to Betfair.
I saw one today that was $3.20 on the TAB & was showing $6.00 on Betfair & it won, punters have been short changed for years by the TABs if one targets the top 3 in the betting.

Cheers.

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Cheers.