I run 36 front and rear, and always will. The recommended for my bike is 42!! That is WAY too hard, and it makes my tires slide around because of the small contact patch. You should adjust the pressure to the type of riding you do. More for easy riding, less for more aggressive riding. If you go too low, your tires will fold in a turn, and you can break the bead, resulting in a bad day.
Miraclegrau's mechanic, among other things...