That's interesting Matt. I think at one time i was certainly a swinger but at sometime an element of hitting has crept into my game, now it's neither or. As for my left thumb, i'd say the base is right on top and the tip points to 1 oclock, if that makes sense.
I did find an old post talking about the aft side and i'm finding it awkward placing my thumb there, even alowing spacing between the thumb and forefinger. Seen any images around of this placement of the left thumb, that would clear things up for me?