If I can relate this to baseball and golf ala Sawbones...
In baseball and in golf the shot that goes the furthest is the one you never feel, the one in which you almost wonder if the club hit the ball or if the bat hit the ball at all.
In bowling, the best ball you throw, the one with the most devastating impact on the pins, whether it be flush or light, is the one you almost never feel your fingertips hitting the fingerholes or your thumb escaping from the thumbhole.
This doesn't relate to your question about finger position, but what will happen is you will try to imitate the pictures on Mr. Clifton's website. Since you'll be thinking about your hand and finger position every time you execute, you'll never get to that "good" spot, until you relax and let your body (and every part of it: feet, hands, arm, AND brain) just do its job. That's almost more important than where your hand is at any one point in time.
In my honest opinion, once you relax and let your hand come thru the ball instead of around it, your release will become more effective. Every time you try to make the ball hook, your release will become less and less effective.
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Bowling: Just like hand grenades and horse shoes, you only have to get close.
Life: Deal with what is.
