As noted above, tire companies generally list a max. pressure, not a recommended pressure. That's logical since they can't know enough to suggest anything meaningful.

In any case, the pressures you see in calculators are based on lowest rolling resistance on relatively smooth roads. That's not always the ideal pressure because other variables come into play. For example, if you're using somewhat narrow tires on roads full of potholes, you might want higher pressure to prevent "snake bites" or rim dents. On roads with coarse pavement, lower pressure reduces chatter. Conversely, on glass smooth roads, you can go higher since chatter isn't a worry.

So, consider everything you see, read, or hear as simply a guideline, and dial in your optimal pressure based on experience.