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That is very strange for sure. I haved a L99 tuned by them as well and mine is pretty aggressive in both modes but S moreso... I would PM Dynosteve (RDP) here and ask him about it if it were my car. He is a great and helpful guy and might be able to offer some insight. Or perhaps give your tune another look see....
When was the last time the tranny fluid was changed as I see the car is a 2010?
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