In reviewing this information about post 8 exactas and tri's, I stumbled across an anomaly. The Jai-Alai Heaven trifecta values for 843 and 846 are both at 1 in 283. Not only is that strongly counterintuitive, but it doesn't match my current sim output either.
The sim seems to be closer to 843 @ 1 in 250 and 846 @ 1 in 312.
Do you have the supercomputer figures?