Back in the day, I had a Threat that was super snappy off the spot. Had 7/8 side, so I wanted to put a crater on the pap. I took it to 3/4 negative, so I removed over an ounce and a half. The ounce and a half didn't make a difference. The void I put in the core made a difference.
Now, I always weighed out balls before I drilled them. If I didn't want a hole, I would keep it under an ounce, so I could drill the ring deeper in case of "mistakes". If the desired reaction required an extra hole, I went big. I had a guy move up from a Cougar to a V2, and he wanted HOOK! So I rev leveraged it, put an inch hole at p3, and dude freaked out. "WHY DOES MY BALL HAVE 4 HOLES? NO ONE ELSES BALL HAS 4 HOLES!"