Exactly what Nick said.
The statement about the "cg down kills the reaction on low rg balls" is incorrect. The statement about the "ball going longer by taking out the thumb weight" is incorrect. Both are irrelevant. What matters is pin distance from PAP and extra hole placement. The position of your extra hole is not in a beneficial spot. Also, if it's going that straight why would you polish it more? Did you feel it was burning up early? Also, you said you gave it a nice coat of Brunswick Factory Finish Polish. Which one, High Gloss (blue bottle) or Rough Buff (red bottle)?
I would recommend plugging the extra hole and moving it to where Nick mentioned. I would also recommend hitting it with a 500 abralon and leaving it at that to start with, then go to 1000 or higher if needed. Please let us know what you try and how things progress.
Regards,
RoB LaW
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I'm gettin' old, I'm hurtin', but I've got Brunswick balls.......Color me competitive.