Another idea is to Target races where the whole field has 90+ pts in UniTAB ratings.
This tells us that the field strength is high & anything can win.

Try & see if there is a slight weakness in the Fav.

If there is , its weakness will only be compounded due to the field strength applying its pressure on the Fav.

Now target that race with your filters.

Quite often the Fav gets beaten in these sort of races & the Trifecta can pay anything.

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Cheers.