The idea of targeting the prepost market is a strong one.
I have found that the pre-post market ranking more superior in SR, than any of the dozens of form rating service that I have seen.

I feel with quinellas , that it is important to try & target the best field sizes so as to try & get the best value to risk.
There can be value in Quinellas but there also seem to be a lot of short payers which knocks the averages around.

I did an execise once of 200 races targeting races with 11-12 runners only, boxing the 5 pre-post runners & it fell into a big hole , never to be seen again.

Someone could maybe offer some angles to look at in these size races, because there is some big payers that get up.

Cheers.

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Cheers.