I think you have the right idea... I would look first towards the DSC based on your description. Although it is also a possibility that you may have a wheel bearring issue. But, it sounds to me from what you are saying, and your description of the symptoms, is that it feels similar to when you lose traction with DSC on. This sometimes happens and is usually one of two things... either a wheel speed sensor or a faulty dsc unit. I have seen one rare occasion that a bad differential caused similar symptoms. Take it in and have the dealer do their thing. Get it fixed before it becomes a major problem.
There is always a chance that some of the other suggestions mentioned could be a culprit, like tires rubbing. Perform a careful inspection underneath and look for the obvious signs of rubbing or interference.
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