Hello Peter, thanks for the update.
This looks alright to me even if I should mention that the conversion process you are showing should only be used for logos and client’s brands. Not for actual textures.
This topic has been detailed a few times on ACESCentral and using the ODT as an IDT should only be used for non-PBR elements.
Here is a link I found very interesting : Utility-srgb-texture too dark Hope it helps !
Regards,
Chris