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Sounds more like a measurement problem to me if there is no fixed trend over a lap.
Just because you have a dry sump doesn't mean you can't get oil starvation. The oil in the dry sump tank will still slosh around and can uncover the oil pickup with the obvious results. Have you tried running a higher level in the oil tank.
The other possibility is oil aeration. The 'oil' being scavenged out of the engine will contain a high proportion of air. The dry sump tank will typically be designed with some sort of swirl pot arrangement at the top for the oil return line. If this is not a very good design it is possible that all the air has not separated out before the oil is drawn back into the engine from the bottom of the tank. This aerated oil is bad for the crank bearings and if present in large enough quantities could give you the oil pressure symptoms you are seeing.
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