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Most pinging or detonation will occur during low RPM / high load conditions, or "lugging" conditions. In such a case, adding timing will only exaggerate the problem. You want to either remove some timing via the custom adjustments or run higher octane fuel.
One thing to keep in mind is that most stations have switched over to winter-blended (oxygenated) fuels, not to mention that nearly everything is 10% ethanol now. Getting tough to get any good quality fuel anymore. Ideally, ethanol has a higher octane rating than straight gasoline but it just doesn't have the performance that I get with straight gasoline.
Ah well... in 20 years we'll all be running on hydrogen generators anyway.
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