"By adding capacitance to the Horizontal Output Transistor (I believe you call it Line Output), the horizontal width will be affected. The HV (EHT?) will change a bit but it shouldn't be enough to cause issues. "

Adding capacitance across the primary (or any winding) of the flyback will decrease the HV, which I don't care. I watch at night and could turn it down. I only got it set bright so it doesn't shut down after startup. Adding that capacitance also will lengthen retrace time which would make the APPARENT overscan worse. I mean, with the increased retrace time it would SEEM to overscan more.