proper custom viewer lut workflow

Ok, we’ve got a project where we’re working with S-Log plates and Linear 3D files.
I’m trying to sort out the pipeline for Nuke, but i’m having a bit of trouble.
In shake we’ve got it set up like this:
-S-Log to Lin node
-Lin to S-Log node
-Cinespace viewerlut to view the S-Log files, to see what the grade will do to them.

What i’ve got so far in Nuke is:
-S-Log curve for read nodes
-.3dl file from cinespace/cinecube
-expression nodes (with same expressions as the shake Slog-lin nodes)
-vectorfield node set to viewer_input (with the .3dl file, and color space in to S-Log and colorspace out to sRGB)

When I view an S-Log file (with the colorspace set to S-Log) with the vectorfield node, it looks really similar to what i see in my shake viewer with the cinespace lookup (but still the whites are a tiny bit brighter).
But it doesnt make sense to put the vectorfield input to S-Log does it? If i set it to sRGB, the whites get a bit too bright compared to what I see in the Shake viewer.

Ugh…it’s getting a bit confusing. Or is it that it’s never going to look completely look the same as in shake?
Can someone recommend me the correct way to set this up?

Thanks,

Tom

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