Well, a lot has happened since I posted the original question. I spent a good deal of time on another forum and followed hundreds of post there. I did follow many of the troubleshooting methods posted here, I did not switch the lines but was already confident that the head was dirty.
I cleaned the head, flushed the lines, replaced all the carts with new ones, Cleaned the dampers, nothing seemed to help.
My final solution involved buying a used 4800 printer that was used for it's intended inks and basically swapped out many many parts from it to "revitalize" my flexijet. I replaced the ribbon cables, motherboard, head, several smaller circuit boards, one entire cartridge bay assembly, dampers, encoder strip, encoder strip sensor, light sensor, maybe more that I can't recall. Bottom line is I basically have a new printer now in many respects, the parts I installed were barely used.
You might be asking why I did all this, the reason is somehow thru the process of trying to clean the head, I managed to lose printing completely and then had to go part by part to find what electronics were not functioning.
For the guy that mentioned a cleaning service for heads, I am interested in that. Very curious to know what that involves. I gently push distilled water thru the head to clean it, I don't know of any other way. Thru the process of getting my printer up and running, I now have 2 spare heads (although one is delaminated).