BTW, thoroughly enjoying this. I know supporting the xbox has its own set of challenges, so thanks for continuing the effort.
I was having trouble getting Mansfield to come to the HQ. So after getting an Xbox Series S for early Christmas (which has its own set of trials it turns out), I started a new completely new game with a severely restricted set of mods. I then "quest skipped" to the end of Chapter 1 (which is ALSO a very interesting thing to do.

). This time I've played all the way to "How to HQ" and Mansfield did come correctly this time. Here's what I've learned:
Save often (because the Series S crashes all the time anyway) so you have something to go back to.
Be Patient. Don't shoot every gunner on site (ex, Vault 75...shot the guy beside elevator before he said anything and had to go back one save)
Wait for the dialogue to complete. I seem to have a better experience not skipping through the dialogue. I got caught in sunken ship that way, and scripts seem to need the time to line up correctly.
Sometimes it just doesn't work and you need to try again. On my first playthrough I got right through HQ, saw Captain Wes, etc. On my Series S playthrough something didn't trigger so Captain Wes never showed up. I think (once again) I killed the gunners on the second floor too quickly so I never got the "what are you people doing??" dialogue. So again, full saves at the end of every quest so there's a bookmark to go back to. Right now, my only problem is that I can't get the first edition from Alyson...she just says "Oh Hey!"....so I think it's another time where I skipped something necessary....But this time Pastor Edwards is cleaning up the church, Mansfield is there, and I know how not to screw up the sunken ship....all good.