I think you already know your answer the rears need to be a 30 and then the diameters from front to rear will be just about spot on.
This is just semantics but its the traction control not the abs. It is detecting the difference in diameter between the front and rear tires as difference wheel speeds and assuming the car is skidding and trying its best to correct the problem. You can always disable the VDC. Someone with more knowledge than mine could chime in as to whether the abs remains intact with the VDC disabled.
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