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I wonder if the additional wall area is increasing the diffuse solar reflected from the ground which then enters the window. I would think a ray striking the wall, scattering backwards, and some of that hitting the ground, would never enter the window (ray tracing), but it's worth a look at which components are affecting the window's incident solar. If you haven't already, I would look closer at all these reports.

Zone,Average,Surface Window Transmitted Solar Radiation Rate [W]
Zone,Average,Surface Window Transmitted Beam Solar Radiation Rate [W]
Zone,Average,Surface Window Transmitted Beam To Beam Solar Radiation Rate [W]
Zone,Average,Surface Window Transmitted Beam To Diffuse Solar Radiation Rate [W]
Zone,Average,Surface Window Transmitted Diffuse Solar Radiation Rate [W]