My research involved esoteric meditations on each astrology sign and countless hours doing energy work with people daily for years and recording my own data. Anyone interested can read my threads on archetypes, functional definitions, and the eastern correspondences too.
Again, Gulenko's IEI is really ENFP. It is Me - extroverted Pisces energy he is describing. Extroverted because external and Pisces is above the horizon as are alle traversed signs. The Fi is Leo ruled by the sun which makes one very charming when combined with the Pisces influence (versus Sagittarius which is sporty out of bounds Se).
I do not endorse Model G.