There are some teachers out there(some of them TGMers) that recommend a PRE-SET of the spine at Setup(Address). They usually want a few degrees of spine tilt to the right at Setup, or advocate the left ear being over the navel. They may say it any number of ways, but it is a Pre-set Axis Tilt.
What are the advantages and disadvantages of this? I seem to do better with the head CENTERED between my feet.