It isn't about where the pin is in relation to the grip....it's where the pin is in relation to the PAP. Pin over the middle finger is further from the PAP than ring finger, so it would TEND to go longer. However if you track high you would be putting the pin in your track...this could make the ball very stable and roll pretty awful.
PAP is what you are looking for...not in relation to finger holes.
Little known fact: In Russian "Hope" and "Change" translate to "Tax" and "Spend"