[Jeff]

I think that it is a mistake to causally equate a large amount of secondary axis tilt with hitting upwards at a teed ball when using a driver.

Here is a capture image of VJ Singh from a swing video.



VJ Singh always hits down with his driver - note the forward clubshaft lean. However, he has a large amount of secondary axis tilt.

I think that a large amount of secondary axis tilt in long hitters (like Tiger Woods and VJ Singh) better correlates with a need to keep in balance when swinging at fast arm speeds.

Jeff.