If Bob at pro-products said X, and X is working, I don't think it's wrong.
I was just telling you what I do. Keep in mind most of my tanks are 6X2' and I have RHP and heat tape on the hot side with probe and that creates a nice gradient all the way to the cool side, where I have a separate heat tape set to 78-80F for cool side temps (running off a separate thermostat). It gets down to about 80-82F by the time I reach that heat tape on the cool side.
I think AP do too, but Boaphiles are fantastic at holding heat in and the cool side heat tape doesn't run too much, it's really just insurance.
To answer your question, ground temps with the heat gun. If it's 93F on top of the hide but 86F in the hide, the latter number is what you should pay attention too.
Wasn't clear what you were putting in there, a BP or a Boa.
Either way:
Hot spot - 87-89F
Ambient temp/average temp on ground in the middle of the tank: 82-84F
Cool side: 79-81F
The big difference between BP and BCI/Boa is humidity. BP's can be 50-60% with higher levels when shedding. Boa's really want to be closer to 60% with spikes when shedding. Temp wise, they are very similar. As mentioned, Shayna and Behira's tanks run off the same thermostat.