We never did hear the details of your injector testing... Those things can dribble, druel, piss, do anything but hold pressure and pop if they aren't serviced and well-adjusted. Did you get 'er done? Did they chatter good? What PSI/BAR range did you set them to? Were they screw or shim-type? How many holes did the tips have? Did you anneal the copper washers and gaskets before installing them, or use new ones? (FWIW, my truck seems to hate one hole nozzle tips... makes it hunt bad at idle when cold, and the smoke just cascades down around the truck and fills the neighborhood)
When you had the injector lines loose, did you happen to shoot some brake cleaner/carb cleaner through them to make sure they were unobstructed?
After you worked on the IP, how much up/down travel did you get from the HH plunger?
Does it act any differently if you try to start the truck with the air filter and canister removed?
Did you take the turbo intake loose, grab the compessor wheel, and see if it's spinning freely? Could you feel it scraping the inside of the housing at all while turning/pushing the shaft to the sides/up & down? Was there any oily, black residue on the compressor wheel?
I wish you lived closer, I'd pop-test those injectors for ya, and run a scope down in the cylinders whilst at it.