Ric,
Whenever the pin is at leverage, 3 3/8" from the bowler's PAP, you are going to get a lot of flare and a strong reaction.
Positioning of the CG (& MB) is a 2nd-ary effect (vastly reduced) compared to the pin's position. Placing the CG at 105 degrees (usually that is label or center of the grip, BUT NOT ALWAYS!) will make the ball arc later, than if you place the CG at leverage (MB near the thumb) or kick it closer towards the PAP (or the MB towards the VAL).
Label drillings can be for heavy oil;; it depends on the bowler and the ball and what he/she wants the ball to what and when.
A drilling is not for medium or dry lanes; a ball is for medium or dry.
--------------------
"Just because you can do something does not mean you should do it."