If i can kill them, loot their corpses and rob thier safe of a one of a kind invaluable text with no consequence, why does taking barely enough cash to cover dinner from their bank cause humanity loss? The online banking for the hunters in the skyline apartments has a humanity loss. A toreador might have an intoxicating smell, a walking corpse should have a noxious smell. The loading screen text for the Samedi describes their smell as 'intoxicating'. (maybe changing it from the heat vision effect to use very low magnitude auspex visual effect, hopefully the higher lvls of auspex would override that) If this is a hard coded limitation that a mod can't fix, i would suggest removing the effect from Obeah.
Does not matter which order the abilities are used in. The heat vision effect in Obeah overrides the auras from auspex.