I think I can see EIE, too, just as @Sol and @Tallmo do.

If you are EIE, then you and I share Ni and Se, but you are socially expressive with Fe, while I am coldly logical with Te. I also appeared very introverted in the past, but much less so as I've gotten older.

Granted, your self-description of being introverted doesn't correspond to most EIE's, but I've met an EIE female who is very circumspect. You resemble her a lot, and you also have some of the same expressions as an EIE male whom I know. The EIE male is married to an LSI technical writer, and the EIE female is in the Air Force and has a male LSI assistant. The EIE male also seems very quiet and unobtrusive most of the time, while nevertheless being able to emotionally manipulate everyone around him.

I don't think you are IEI. You seem to have more Se than they do. You just seem to have more social assurance than the IEI's that I know.