I use this set up, it seems to work most of the time for multi-layer V-Ray EXR files: Project Settings Working Space set to sRGB or Rec.709 depending on your output. Linearize Working Space On. 32 Bit. In your comp have your layers set up like so: Any graphics sit at the top. Adjustment Layer: Color Profile Converter effect. Input and Output set to sRGB. Tick on the Linearize Output Profile. Adjustment Layer: OpenColorOI effect: Input Space: ACEScg. Output Space :sRGB. Adjustment Layer(s): all of your colour correction effects sit here adjusting the layers in ACEScg colour. Stack your Lighting, Reflection, Specular, Self Illumination etc, EXR passes here. Please feel free to correct me though if the set up isn't totally correct, but it seems to work for me when I work with V-Ray passes and normal graphics from clients. It looks like ACES colour is being fixed in the new beta versions of AE, lets just hope they've made it super simple to use as it is currently a right headache to get your head around it at first.
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