They all seem to have their good & bad runs.

I feel that its important to only bet them if paying at least $3.00-9.00
If not, target the 2nd selection $3.00-9.00
If not , target the 3rd selection.$3.00-9.00
Either that or leave the race alone, if the top selection does not qualify within this price range.

If one cosistantly takes prices less than $3.00, one is in for a hiding to nothing long term.

The $9.00 cut off , tells us that it is in the market with some chance of doing something & saves a number of wasted bets.
One will see from time to time ,that the first selection is paying $15.00+ & most times they tend to fall over & beaten by their 2nd selection paying around the $5.00-6.00 mark.

A staking plan that can work on them, is this mild ladder progression that goes up in lots of 5
e.g. 11111 22222 33333 44444 55555 ect. up to 12 12 12 12 12 for a run of 60 bets = $390
Keep going up the ladder win, lose or draw until 2 units in profit.
Then start again.
If one does get to 60 one will find that a number of winners would have been struck, so losing the total $390 is unlikely.
One has to have the fortitude to go to the last dollar with these sort of plans & have a back up of the same amount to do it all again.

If one is interested in only targeting one venue per day.
One could set this up so that the progression goes from race No.1 to race No.1 the next day & so on, until that column for that race No. shows any profit. Then start again for that race No.
Do the same for race Nos. 2-8
That way it can be a set & forget type progression which could be good for busy punters.
This is something Partypooper touched on.
I feel one would have a stronger chance of success doing it this way long term than say level stakes.

Cheers.

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Cheers.