I have looked at races where there are quite a few resumers but could find nothing consistent with laying and also betting. I think someone on this forum also investigated it but from what I remember it fizzled out.

My Place system has lost over the past two days, but not too much of a loss. It is showing a current POT of 18% for a 73% strike rate. Quite a few losers have run fourth so I'm hopeful. It's still early days.