I confess to inexperience in betting coups, but in this context, betting $60,000 in one chunk at the last minute strikes me as the wrong way to go about it. If you know from the doubles that the computer groups think your horse should be 7/2, letting his odds stay at 6-1 throughout the betting is an invitation to the computer groups to dive in late. Wouldn't it be better to dribble enough money into the pool to keep his odds around 7/2, so that the computer groups don't bet? That way, you get the public's money mostly to yourself, rather than having to share it with the computer groups. Or would the computer groups notice that?

Interesting that Firenze Fire was also bet more heavily in the exacta pools than in the double pools:

https://twitter.com/truxtonstables/status/1016496763581104129