Looking again at your CFD images of aiflow around the stab. These images are (i assume) looking at the 'low' side of the fuselage i.e. the side that faces the relative wind approaching the fuselage. What do things look like on the leeward side?.. If flow remains attached (that's probably a big 'if') then i'd expect flow direction to be opposite and to (at least partly) counteract any stab height induced tucking effect.?