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Your posts are a bit confusing - in #10 you show an arrow to a dielectric (=insulator) and write that this is aluminium (=metal), so it is difficult to understand what you really build.

If your cables have a shield, then inlcude it in the model (with the real conductivity) and leave it floating, not connected to the ports. It will have an effect on line impedance, even if it is floating.