Without additional information, your setup looks correct. The reference impedance of the ports in HFSS does not impact matching, but rather is the impedance used for measurement of the S-parameters.
The port definition in HFSS should be consistent with the ports used to create the SMD model s-parameters. In your case, the reference is the top ground layer and the signal pins are on the same layer. Identical to the ports you defined - so all is good.
If you're unsure, you may try using the reciprocal network to create a virtual test fixutre, then extract the s-parameters from your HFSS project to extract only the switch model. You should get something very close to the original s-parameters.
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