Thank you. That's actually the chart I used to set my pressures at 90 front, 100 rear. 180 lb rider, 30 lb bike, 20 lb backpack = ~100kg. I think I was reading it right ;-)

I wish there was some way to know how other widths would feel without having to buy/try them! There may be some way to extrapolate how an under-inflated 25mm tire compares to a correctly inflated 28 or 32, but my chart reading skills are not that sharp.

Maybe my engine/bike/luggage combo is also a little heavy for 25s?