I also queried the door pillar tyre pressures on my 3300Kg Mooveo/Fiat, but after due consideration and trying out I am actually, within 1 psi, sticking to the advised pressures.
These are 79 rear and 73 front and whilst the ride is a bit on the firm side it is not excessive.
The Punctureseal guy never turned a hair, or queried the pressures, when re-inflating last week after the treatment, so he obviously did not find it unusual.
Personally I would sooner be slightly over inflated than under (fuel consumption, tyre wear etc), though no doubt someone will tell me that's wrong.
Forgotten, but not gone.
I was apathetic but now I can´t be bothered.