Racquet stiffness and string tension

First, sorry if this post should be under the strings section rather than here.

Something I've long wondered about: Is there some ratio that one can follow to know about how many pounds in tension one should go up with each point of less stiffness in a racquet?

To put it another way: for a racquet like the K90, because it's relatively stiff, it makes sense that Federer strings it up at a relatively low tension, around 48 to 51, according to Nate Ferguson of Priority One.

Contrast this with a racquet with more flex, say the PB 10 mid - my feeling is that one can increase the string tension quite a bit, say, even up to 58 or 60 pounds, without feeling like the racquet face is too boardy.

So I'm wondering, is there any time-tested rule of thumb for increasing or decreasing tension by "x" number of pounds for "y" points of higher or lower racquet stiffness?

I realize that string tension is a highly individual thing, but I guess I'd like to know if there is some general guideline that tennis nuts like myself could benefit from following.

Thanks for any thoughts...
 
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