[YodasLuke]

How stiff? I know that is a matter of fitting the individual, but can you post the flexes in yours and Ted's clubs, just to give us an idea.

In this department, I only have my personal experience in fitting to give. For what that's worth, here it is:

I use the stiffest, steel shafts in my irons that Henry-Griffitts offers. From the appearance of the step-downs, I'd estimate they are in the X100 range of dynamic shafts. To my recollection, Yoda uses the shaft that's one step lower than mine. All are "Pured", including the putter. I do have graphite shafts in my driver and 5 wood. They are also very stiff and "Pured". History has shown me that hitters prefer stiff and heavy, and swingers are all over the map. Some of the best engineering minds (Karsten and Kelley) have always been proponents of 'stiffer is better'. Karsten had 90 year old women playing stiff shafts. I think that might have been a little overboard with an ideal, though I wouldn't have chosen an engineering duel with the man. Maybe Karsten was a closet hitter.

My own hypothesis is this:
You need to use whatever shaft allows you to sense lag pressure. When fitting using trial and error, there tends to be A shaft that becomes the one for every individual. Centeredness of the strikes becomes better, along with trajectory, and distance. Some have surprised me by needing stiffer shafts and some needing weaker shafts. But, once you find the one that works, it's hard to rationalize making it stiffer. I've also found that it's not all about velocity. Clubhead speed does not equal stiffness of the shaft. There is a mass component.

I know that when I use a more flexible shaft, I can hit it off the planet to the right. It feels like I'm over-stressing the shaft. The stiffer the shaft means the more accurate I become. I find it difficult to push a rope.