[EdZ]

Edz, can you go into more detail on this (why less in the palm helps, etc..)? Maybe you've posted about this in an older thread and could simply provide the link?

A bit of anatomy and a touch of geometry involved, but in a nutshell the palm left hand grip does not allow for a large enough angle between the left arm and club (assuming a flat left wrist). Getting the grip under the heel pad allows the same cock/uncock travel in the left wrist to create a much larger angle with the left arm, while still being basically flat. Of course one can always go double cocked (Hogan), but this requires either perfect CF Rhythm, or a non auto release.