Anonymous“Have I got you right on all those points?”
No, not at all.
Anonymous“And, MrP, your #4: You do not know whether "must" in "I've had a wonderful evening. I must see you again." is more the default or prototypical form when compared to the "have to" in I've had a wonderful evening. I have to see you again."
”
Both examples sound a little "stagey" to me. Certainly they don't sound like something "young people" (as you put it) might say.
I would be more inclined to expect them from a middle-aged speaker with a theatrical background (perhaps in British theatre of the 1930s).
All the best,
MrP