One thing to consider is that our steam-age suspension systems did rely on a bit of tyre flex to maintain decent roadholding. If you have considerably higher tyre pressures, you lose that tyre flex and reduce the contact patch.
I fully agree with that, tyre contact being smaller than the size of the palm of your hand.
I must admit I'm in a bit of a dilemma because I really haven't noticed anything amiss with my bikes handling and my tyres don't show any signs of wear on the outside edges, being a sure sign of under inflation, or the middle, being a sign of over inflation - but then I don't push it to the edge of the envelope.
I'm going by the general consensus of opinions both here and other places that I should increase my tyre pressures. I'm always two up so the rear has always been, and still needs to be near the max pressure of 32 psi for my tyres. It's the front tyre that's the contention for me, but I can't see adding a few extra pounds will hurt. I've always understood that a good guide to aim for is 80 - 90% of the tyres max tyre pressure if you're unsure.
By the way Wortluck, with wax cotton jackets, leather boots and helmets about 380 lbs (27 st) for the two of us.