Yep, same stuff on Sheldon Brown's site.
Alpha, you are way, way overinflated. You will wear out the center of your tires and have a very harsh ride. I've been there, done that. Oddly enough I had to learn my lesson all over with road bikes for some reason, after riding low pressures on MTBs for traction I suddenly think that sidewall number is the 'right' number for me.