The "correct" pressure for any vehicle is the one listed on the door jamb (cage) or manual (cage or bike). The same size tire can be used on anything from a compact car to a light pickup, and the pressures vary depending on the vehicle, so using the sidewall rating won't apply for your specific vehicle. That is simply the safe working pressure of the TIRE, not what is best for the VEHICLE. So if you are in a compact car and set the pressure the same as a loaded pickup would use, you will be WAY over inflated. The same for a bike- do you think the same tire used on an ST1300 would use the same pressure as it would on a bike that weighs 200 lbs less, rarely has a passenger, and has no luggage carrying capacity?
With that said, I tend to set tires to 1 to 2 lbs. over what the suggest pressure says. This takes into account:
-Variation of tire gauges. It is better to have a tire 2 lbs. over than 2 lbs. low
-Loading/weight of the vehicle- especially with our STs, it is very common to overload them well above what Honda rates them for. Add a big rider, a good sized passenger, and a weekend's gear and you will be well over the STs limit, and the weight the tire pressures were set for.
-Fluctuation of tire temp- Proper pressure check is done "cold". The pressure will increase as the tire is used and warms up. But what is "cold"? Parked in your sunny driveway on an 80 degree day? Or in your unheated 40 degree garage on a cool spring morning? Setting the pressures 1-2 lbs. higher on a cooler morning means you will be close to the mfg's rating on their "average" cold day. And having it set 1-2 lbs. over on a normal day means your tires will be at a safer pressure on a cold day.
-You lose pressure every time you check your tires. Having them a couple lbs. higher means you can check your tires more times before you end up having to add a couple lbs. And we all know most of us don't pull out the compressor for being a lb. low, so this keeps us at (or above) the rated pressure longer.
A good exception for all this are high performance tires used on the track. 1 lb. makes a difference there, and pressures are set according to track conditions, not any specific rating.