Perhaps the other thing one could do would be to concentrate on those asessed at $2 - $3.60 (someone here had figures for that).
I,ll trial that today at Townsville.
i.e
Race 1 H 2 (minimum $2)
Race 4 H 1
Race 5 H 3 + 7 (minimum $3)
Race 6 H 5 +9(ditto)
Race 7 H 2

Cheers
darky