Dick,
Based on your description of you and the oil pattern and my recent experience with an Onslaught, drilled for a friend, on our medium-heavy oil pattern, I would NOT drill this ball, the Hercules, for that condition and your release. I'd guess it was too strong. The Onslaught, an apparently very even ball even with a strong drilling, would *probably* be more appropriate. If you did drill the Hercules, you's need a length drilling and more than likely some extra polish, even though it looks like a polished pearl out of the box.
There's an Onslaught thread in this forum, a week or two old; take a look at it for some details.
The Onslaught is nowhere near as strong as the BJI review indicates.
My best guess.
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"Those who do not remember history are doomed to repeat it."