I have been trying to master the twistaway with my driver and by utilizing the Manzella neutral grip (previously had a "strong grip") and the problem that I have been encountering is as my backswing nears it end (at the top), with the twistaway, I am feeling that my left thumb (I'm a righty) is not under the clubshaft. Should it be? I tend to sometimes have too flat of a swing, could this be contributing to the problem? Thanks.