Try This

The first last start winner you come to between TAB 1-7
that is also starting between Barriers 1-7

Most races have 14 & less runners ,we are covering at least half of the inside field in the majority of cases.
We are assuming the out side half has a less of a chance of getting up.

Stats show Barriers 1-7 win 55.2%
1-8 61%
1-9 66.7%
1-10 71.7%
1-11 76.9%
1-12 83.2%
1-13 88.5%

Go over your past results & see if barrier has any impact on the overall figure.

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Cheers.