Dear smoothjazz,
Indeed, what have you got to lose? Please allow me to make sure I follow.
By "service program", you mean Epson's Adjustment utility, running on Windows?
By "Using Windex in refillable carts", you mean pure Windex?
By "numerous ink charging cycles", you mean Ink Eject cycles followed by Ink Charges cycles? All in the same day?
By "run charge cycles with ink until it appears in the nozzle checks. Keep running until 100%.", do you mean you keep pressing the Run button with the Ink Charge radio button selected? I did not know more than one Ink Charge cycle would "work" at a time, and you seem to imply that one Ink Charge cycle may not be enough to "fill the lines"? Enough to show on nozzle checks? I sometimes observed that, after Ink Charges, a particular nozzle, like Yellow, would only show faintly while all its nozzles are visible. Could that be related? I never knew how to explain this. As though, the nozzles were not clogged but only "partially showing".
I've gone through 4 Maintenance Tank so far...