I'm not nostalgic much at all either and don't really see it in any INFPs I've known, including e9s. I think it's a poor grasp of what tertiary Si looks like in an INxP. I just don't see it at all that way.
The bolded is only something I can dream of. That's one of my biggest struggles in life. I struggle to clearly see how people feel about me. I seem to project dislike/criticism &/or naively feel liked when actually being manipulated - which reminds me of inferior Te as described by Jung for Fi-dom. I waffle between extremes in trying to gauge this. I certainly focus on it, but I am very uncertain.
I don't know how to manipulate bonds either. I generally feel at the mercy of someone else. I can mimic certain social formulas, but then I get frustrated when it doesn't work like it "should". I have that "missed the memo" feeling in this area.