Donut Size Connecting PVC Pipe To Cast Iron Hub

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Boston, MA
I am trying to connect 2'' PVC pipe to an existing cast iron (CI) hub. The inner diameter of the CI hub is about 3-1/4''. The same question was asked previously by someone else ( but no final solution was posted. He tried three different size of donuts 3'' hub to 2'' PVC and 2'' hub to 2'' PVC (Fernco 33U-205, 22U-205, 22UX-205), and none of OD of those donuts would fit tightly into the 3-1/4'' ID CI hub according to him. He also tried oakum and solil-o and failed the inspection. Does anyone have the same issue?

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