If you put it above the PAP, that should add thumb weight, causing the ball to roll earlier.  It may not change the total hook of the ball, but it should smooth it out some.

SH

Depends on the layout (pin placement) of the ball.  The maximum flare increasing hole would be 6 3/4" from the pin.  Relative to the core, with the pin being the very top, 6 3/4" would equate to a right angle (or 90 degrees) from the top of the core...  basically directly into the side.  If you think of the core as say a coffee mug, removing some of the side of the core has the same effect as making the core taller (basically increasing differential and flare potential).  The closer the hole gets to the pin (or 13.5" from the pin which would will be the exact bottom of the core), the more the top of the core is removed (basically acting to shorten the core or lower the differential).  This would act to reduce flare, and smooth out reaction.

Generally speaking, holes on the PAP, on the vertical axis line above the PAP, or inside the VAL will reduce flare.  These are usually closer than 6 3/4" from the pin (as layouts normally have pin positions around the finger area).  Holes on the VAL below your pap, or beyong the PAP, get closer to 6 3/4" from the pin and generally increase flare.

As far as size goes, shallow holes have less effect, deep holes have more effect.  The trick is to place the hole to achieve the desired reaction while still maintaining legal static weights.
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