I have not been able to look at the video on a big screen so can't see any details of air bubbles. It sounded like it was running on all four so the good news is your injectors are ok.

You said: "I have yet to see bubbles in the clear lines from the lift pump to the secondary filter, or secondary filter to the IP. Just in the one from the pressure valve." Are those lines new? If they are old and brown, it would be difficult to see air bubbles. What did the clear temporary cigar hose replacement show? There should have been lot's of bubbles there when you had it running. That is the best place to look for bubbles, since all air ends up there (pri and sec filter, IP, injectors) Once you have solid fuel there and bubbles do not show up later, your fuel system is tight.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked