All other things being equal; A lighter shaft will increase CHS and a longer shaft will increase CHS.

As for the taller/shorter thing, by all means a taller guy is going to use a longer shaft - and undoubtedly find it easier to swing as he'll be in a more athletic position. We need to look at how long the shaft is relative to your ability to control it. 7'7" with no arm strength my find a 48" driver difficult to leverage, while 5'8" with no arm strength could struggle with 42". However, 5'8" with a ton of strength can easily handle 48".

I've been talking to a fitter in Indiana who swears by a heavier shaft at the same length, and only use flex for feel. His results with it are pretty good. I've subscribed to the 'use the stiffest shaft you like the feel of' theory for a while. If you can hit it Tour distances, then shouldn't you be using Tour flexes? Not one of those guys is using anything softer than X - and in fact, their X flex gear is usually tipped some more. Why? For consistency and accuracy.

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True Length Technology Fitter - www.truelengthtechnology.com
It's live! - www.ShipShapeClubs.com
PCS Class 'A' Clubfitter

A new highlight: Golfing the home course on Christmas Day.

I say it too often: If it's golf club shaped, you can play with it.

For the record, I'm a club doctor, not a swing doctor.