I have been trying to get this fix working for me for a long time with no success. bgBalancingEVOptionalSeamReducerHighElfFix.esp is an optional file that comes with Race Balancing Project. Its purpose is to remedy a side effect of Luchaire's HGEC Body Seam Reducer, which makes all High Elves have yellowish heads and pinkish bodies that don't match. Luchaire's Seam Reducer is a set of three .egt files that go into the Mesh folder, two for bodies and one for the head.
The problem with bgBalancingEVOptionalSeamReducerHighElfFix.esp is that support for it is vague, only saying that Wrye Bash is needed.
My testing npc is Palonirya in the Market District. She is the npc I view everytime I try to use bgBalancingEVOptionalSeamReducerHighElfFix.esp. Here is how it affects my game:
If bgBalancingEVOptionalSeamReducerHighElfFix.esp in the load order before bgBalancingEVCore.esp and bash merged then High Elf bodies will be yellowish and the head is a non-matching default head. If bgBalancingEVOptionalSeamReducerHighElfFix.esp is in the load order after bgBalancingEVCore.esp and bashed merged then High Elf heads will be yellowish and the body is a non-matching default body.
Nothing I have done so far has resulted in heads matching bodies, and Luchaire's Seam Reducer side effect actually looks less bad than the results I've had with the fix.
Eloise suggested that I choose the load order that has High Elf bodies be yellowish and use the NPC Face Color Unlocker to let the heads match the bodies. If I use the unlocker as an OMOD archive it has no effect. If I pack the files into the Oblivion - Textures Compressed.bsa then High Elves and other races willl have neon yellow heads!
It is as if the fix does not want to work properly at all, or else it works for everyone else and mine is a unique problem.