Feedback / Development: Filmic, Baby Step to a V2?

It seems Punchy Kraken look is mapping 0.18 open domain to 0.39 instead of 0.5? Why is that? Regular Filmic High Contrast can have sharper contrast while keeping the 0.18 to be 0.5, why not for Punchy Kraken?

I remember you said this for the ACES transform:

And this was in Filmic Blender’s doc:

Five contrast base looks for use with the Filmic Log Encoding Base . All map middle grey 0.18 to 0.5 display referred

I thought it was a good thing to keep?