I ran the widest barrier idea over several hundred races & found it worked very well in races with....

. Field size 8-12 runners.

.Targeting the bottom 3 horses in the list of runners.

. Selection is the widest barrier of the 3 runners.

. Bet for a place only.

Try & only bet if $3+ can be had at jump time.

It could work well if the Betfair SP service gets up & running, that way all bets could be place at once with a min value attached to the bet to be placed.

On the figures I ran through, I came up with this betting 1% of bank.
SR 20%
POT 20%

Some of the divs are quite amazing e.g. $17.00, $23.00

Cheers.

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Cheers.