Although not thoroughly explained i like your thinking. Years ago Doubles were a big thing among professional punters. It was a great tool to use to follow the 2nd leg ( & probabaly still is ). If the first leg winner was $2w on the tote you would be able to see what horse was their choice in the 2nd leg by means of the doubles divie. i.e if a horse was $5w in the 2nd leg then $2 x $5 = $10. If the double was to pay only $7 you would know what the pros were gunning for the day.

Is this the type of method your using but with with Quin's not Doubles?

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Its the ones you leave, not the ones you take, that give you the margin