After all this diagnostics and deliberation. I believe that my injection pump is bad. Something that I noticed for the first time today (and you can see it in the video), when I bleed injectors 2, 3, and 5 I get a nice crisp squirt of diesel. When I bleed injectors 1 and 4, I get a stream of diesel along with the occasional squirt. From what my research has told me, the (plastic?) diaphragms or seals between the high pressure and low pressure side of the plungers are cracked and this allows fuel to push passed and right into the high pressure side and thus the injectors. You don't notice the issue without the lift pump running because there is no positive pressure on the low pressure side of the pump.
Does my conclusion make sense?
Kris