I finally got it running. I emptied the tank, again, blew out the lines, again, bled the injectors and changed the fuel.
Started up and ran like a champ.
I had done all of the things I've been posting (new filters, checked for debris, etc.) and trying posters' suggestions to no avail. I bled the injectors and the tractor ran better but not correctly at all. I dumped out the fuel I was using which was fairly fresh and got new.
I started her up and she's been running fine since.