I think on the topic of Day 13, people haven't raised issue with it at all. I approached writing it differently and hoped that the change in how David spoke to his son was different enough and less of a caricature to hint that it wasn't just a dream. Plus I'd been fairly consistent on having the dreams flagged as such by stating explicitly Dave was going to sleep. Could be an outlier, might not be, few are actually vocal about this.
Day 14 I can maybe tweak it a little but it's minor enough that I'll just make a note of it and handle it later.
As for Day 15, ah. There's the problem you're possibly running into. Dave isn't magically fixed because he had a cry about his dad, this is more the wound is actually able to start to heal. Much like the comment I made earlier about Dave embodying his dad's actions near the end of his arc, expect something akin to what you suggest much further along the story, maybe near the end to close out Dave's story as a whole. Specifics I'm still drafting out for the greatest cinematic effect possible but the broad strokes are already set.