You seem very attentive to details with your pics... I didn't see any pics with the silicone spacers where the glass meets. I sealed a 180 a while back, with out the silicone spacers. It lasted about 6 months before the pane gave way. After inspecting the blowout, realized there wasn't any "meat" where the panes met. The weight of the glass squeezed all the silicone out between the panes before it cured.