The way I understand it is this. The placement of the CG on a symmetric ball is used to determine whether or not an extra hole is needed to reach the static weights limits and can be utilized to enhance a balls reaction by causing a hole to be needed/placed in a strategic location.
For instance. There is a ball you get, but you want it a bit stronger than it is normally. Knowing this, you set the ball up with the pin placement you want and the CG shifted to a place that would dictate an x-hole in a location that would enhance the balls reaction for your individual style.
For me, 3 inch pin outs with the pin below bridge and the CG in the thumb-positive quadrant allow me to drill an x-hole in that area that, for me, enhances the reaction and seems to work well for me.
I've used balls like this that, before the addition of the x-hole, didn't seem to kick the corners out like they did after the x-hole was added.
Here is a pic of my latest creation:
http://i284.photobucket.com/albums/ll5/juggernaut_too/Bowling%20balls/0515092122.jpg--------------------
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"The difference between stupidity and genius is that genius has its limits."
Albert Einstein
