Power Service I just learned also has a newer product in a gold bottle that is a more concentrated fuel system cleaner than the grey bottle, which Walmart allegedly started carrying or will be soon. That might be worth a shot.
Hopefully the pickup foot on the bottom of the tank sending unit...
Uneducated hunch from a fellow 7.3 owner: do a run of Redline 15w40 to further help clean up the oil side of the injectors. Fuel side, a couple of treatments of PS diesel Kleen or Hot Shots diesel extreme or similar. Sounds like the stiction eliminator actually did help.
Injector guy in Ohio...