Sorry to keep self-promoting, but have you read my post-Ragnarok fic, Zeno’s Paradox? It’s pretty short, so it doesn’t address all of those issues, but I do try to acknowledge some of the shit that Odin left in his wake. @incredifishface a.k.a. thebookhunter’s fic, appropriately enough called Bookie’s Hug Fic, also makes a point of acknowledging the rift in Thor and Loki’s relationship. @raven-brings-light‘s fic The opposite of love offers an interestingly angsty reading of the sotory about 8-year-old Loki turning into a snake and stabbing Thor.
The absolute angstiest fic I’ve read is @illwynd‘s Over Now. It’s sort of an alternate-ending Ragnarok fic based on the 2004 Ragnarok storyline in the comics, and using that to comment on Thor’s attitude toward Loki in the movie. Warning: darkness ahead.