The reason, why maximum pressure of tire is given as advice, is tocover misjudged weights on tires, and inacurate reading of pressure ( wich is often worstcase scerario to high read) .
Also in this topic you estimate the loads on tire, weighing most likely prooves you wrong and to low yudged.
And then when axles weighed, unequall weightdivision R/L wich makes one tire even more weight on it.
But if you weighed best per axle-end, with still a reserve added, a lower pressure probably is yust as safe, and no screws or rivets trembling loose.