Infp vs infj - Interesting analysis of the two! Personally, I (Kita Inoru) feel that I straddle the line: generally speaking, I identify as INFJ (results of a test I did some time back), but I do recognize some INFP tendencies I have. So, straddling it is
INFJs love discovering what makes people tick. It’s often said that when INFJs look at you, they stare directly into your soul. We rarely miss a thing, from the flat way you said “everything’s fine” to the far-off look in your eyes.