Heres a plane based on backing the wider barriers .

RULES
Target the TAB 1st.& 2nd. FAVS just before jump.(they tend to get up 45% of the time)
Bet the wider barrier of the 2 .

You may wont to add a couple of filters to this plan .
E.G.
Only bet Fast,Good,Dead tracks.
Only bet if the final selection is paying $3.30 or more.

You will see that the wider barrier does seem to dominate , it does pull a number of good winners ,7 days a week.

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Cheers.