I didn't lay the winner in Belmont R7. I had the low odds record at $39 which meant it could be up to $46.80 . The recorded betfair odds I had at the time my program checked was $50.

Maybe its due to the odds being used. I use the pink side of betfair (those wanting to take the bet) and not the other side (current lay odds). If the odds are not under lowest tote*1.20 then I don't place a lay.