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On the track, G forces are the enemy of both your oil and engine. Coming off a corner, the outside cylinder head/cam cover is full of oil, and the oil in the sump is also trying to stand up on the outside wall; your pickup becomes uncovered momentarily, the pressure drops. The oil flooding the outside head will also take some amount of time to drop down to the sump after you are out of the corner loads, so the problem does not instantly go away. Changing oil weight will not help with this, you need better oil control.
Deepening the sump will help to a limited degree, an Accusump system would automatically step in and provide oil until the G forces unload and the oil returns to cover the pickup.
Keeping the oil cooler would also help, as would lowering the coolant temps (third radiator, 160 stat, etc.)
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