techniques to reduce mutual coupling between dipole array elements in HFSS

I have attached the model I am trying to simulate. It consists of 5 dipole antennas spaced in a hemispherical shape. The antenna parameters attached do not show good Power acceptance (1.8472W) vs Power incident (5.064W). I don't know how to account for mutual coupling between the antennas. I attached some snapshots to show the input impedance I am using for all 5 sources, the Z-matrix, the edit sources offset phases. I messed with the offset phases to simulate scanning of antennas, so they don't all radiate at same time, but still no improvement. The goal is to get the power accepted be close to power incident, as to minimize mutual coupling and input impedance. I also messed with Active Z data setting its values to the input impedance of the sources, but to no avail.

I have to show results tomorrow and I would appreciate any tips on how I can get the power accepted value close to power incident.

Thanks.

Can I please get help on this topic?