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I think I found the problem. For some reasons there are some differences between controlling the incoming Diffuse and Direct fluxes through actuators and directing modifying the EPW file with the desired Direct/Diffuse fluxes.

I was using the TMY3 file for Salt Lake City, UT and I was inputing a .csv with customized values of Direct/Diffuse fluxes. The file was read through Schedule:file and, through the appropriate actuators, I assigned the imported values to the Direct and Diffuse components. For some unknown reasons this didn't work.

I tried to substitute the 2 customized Direct/Diffuse fluxes into the TMY3 file and everything worked. Now East and West facades are symmetrical!