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If your problem is what I think it is, it's been around for a long time and is not limited to Corvettes. It used to be called 'radial roll and can happen on any car with radial tires. The wider and lower profile the tires, the more pronounced the 'shake'. It only happens on the front and normally when backing up in a tight turn, not an ELSD issue. It's similar to backing up a 4x4 in 4 wheel mode and turning tightly.
How can you fix it? Basically, you can't. You can try taking much wider turns when backing up to minimize it but that isn't always possible. Short of putting skinny, tall tires on, there's not much that can be done. I replaced tires (for a different reason) on a previous Vette with All Season but it did not help. I'm surprised your dealer did not tell you this.
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