I've seen balls crack all over the place, but usually, when there are no holes, there are no weak spots.
Just keep it off of hard, flat surfaces (cotton towel idea gets thumbs up) and keep it out of temperature fluctuations and you should be fine.
This is, providing, that you wait to drill it until it's needed. Don't drill then store.
I'm doing the same thing with one ball I like (SR300), and I wish I had done it with my Smash Time Solid, because I've had 2 of those now, and wish I had a 3rd, 4th, and maybe 5th.
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Righty
High rev rate (400-450 rpm)
Semi-high speed (16-17 mph)
Book average: 193 (current 236)
For a game based on the principles of science and math, bowling sure does have a bad habit of being illogical.