Please extract the imported source data and recalculate its power. As mentioned previously, EME assumes mode power of 1Watt. Maybe your imported fields have larger than 1 v/m electric fields. However the solver assumes it is 1v/m so yo increase its amoplitude to 1e^11. Usually it is on the order of 1e7. This might be the reason 1e^4.
You can either nromalize the import fields, or normalize the result. eg, S11=S110*Mode_power/Calculated_mode_power.
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