The information and charts is useful-but you also have to take into account the rim "cavity". For example, I own a set of HED Ardennes that are designed for 23 tires but are a little wider than a normal rim. Thus, the tire air pressure needs to be a little lower for comparable results.

Also, I have to go with what feels right. That seems to vary from wheel to wheel. I can run a higher pressure in some wheels that others due to different spoke materials.