The prescribed pressure of TT maker, is also not based on real weights on seperate tires in use.
Sometimes calculated simply for GAWR's , and here even for assumed real axleweights, with no reserve for unequall loading R/L.
But more often nowadays simply maximum of OEM tires. In this case this is to my standards not even enaugh. So as long as my advice comes higher then that of TT maker, I am doing nothing wrong. Also interplyshear is less with my advices.