In my experience, I found out that the most immediate factor which influences sustain is string height... raise the action and you'll instantly have plenty of sustain, unless you have a defective guitar. Since I'm a fan of low action, my sustain will be much less than any other, even if I have a top-notch guitar. This, among other things, will render your chart non-representative.
well my experience has been different, unless you have the action that low that most notes are choking against subsequent frets, string height (or pickup height for the matter) do not have much to do with sustain.
Anyway, this is not a thread about how to get more sustain but rather a statistical tool. I think my UV70p can make many Gibsons turn shy red. Maybe this can be used to debunk certain myths floating around.
If you would like we could add some parameters regarding the setup, action height, relief, under the same common methods of measurement.
btw, when you say low action, can you describe this with numbers? preferably using the definitions of parameters from Rich's site : http://www.ibanezrules.com/tech/setup/action.htm
personally all my axes are lower than ... silly low. From some point on I dont think that raising action helps anywhere. I made a hell lot of tests those last days including any combination of string/pup heights. The verdict is : if the wood wants to resonate a specific note/fret, it will find its way. If not, then no string raising, no pup raising, no exotic metals trem blocks (like titanium) or anything else will make it better.