Using RED Creative LUTs w/ Davinci Resolve

Just got my first RED - a Weapon Dragon 6k. Similar to my other post, trying to figure out the workflow of working with its footage in Davinci Resolve, this time my question is about using the creative LUTs from RED.

For testing purpose, I'm using the RED_PROCESS.cube LUT from the pack.

Since the camera doesn't support in-camera IPP2, I have image processing set to LEGACY/REDWideGamutRGB/Log3G10. I also copied the LUTs from the pack to the camera, and selected RED_PROCESS_to_Rec709_BT1886.cube for 3D LUT. Using an HDMI monitor, it's set to 3D LUT in the monitoring configuration so the HDMI output uses the selected 3D LUT w/ output transform to Rec709 built in.

Now in Davinci Resolve, I've tried 4 different options:

1. Using RCM, with timeline color space set to Davinci WG/Intermediate and output color space to Rec709 Gamma 2.4, then in the color page, apply the RED_PROCESS.cube LUT from the pack to the clip.

2.Using RCM, with timeline color space set to RedWideGamutRGB/Log3G10 and output color space to Rec709 Gamma 2.4, then in the color page, apply the RED_PROCESS.cube LUT from the pack.

3.Bypassing RCM, then in the color page, first apply the RED_PROCESS.cube LUT, then RWG_Log3G10 to REC709_BT1886 with MEDIUM_CONTRAST and R_2_Medium size_33 v1.13.cube LUT to convert it into Rec709 colors pace.

4.Bypassing RCM, then in the color page, apply the RED_PROCESS_to_Rec709_BT1886.cube LUT directly.

The result is 3 & 4 looks almost identical, while 1, 2, and 3/4 looks slightly different with 1 & 2 being slightly dimmer.

My understanding is that LUTs are designed for a specific color space in mind, and the RED Creative LUTs are designed for RedWideGamutRGB/Log3G10 so option 2 seems to be the correct approach, is that right? But this also means that if I have footage from other cameras, they will be graded on a timeline set to RedWideGamutRGB/Log3G10?

There's also an option under `Camera RAW` for "Use creative LUT", but nothing happens when I toggle the checkbox. My guess is that this checkbox may allow me to keep using Davinci WG/Intermediate for timeline color space, but apply the RED creative LUT before the RAW clip is transform into it. Looking at the R3D metadata, 3D LUT Enable is set to false, and Clip 3D LUT is empty, even though it's set & turned on in the camera.

What am I missing here? Is there another way to apply a LUT before a clip is transformed into Davinci WG/Intermediate?

Hi, I am working on a project I inherited from another editor and I am trying to find a LUT you mentioned in your post.

Do you happen to know where you got it from of if you could share it with me?

I am looking for
RWG_Log3G10 to REC709_BT1886 with MEDIUM_CONTRAST and R_2_Medium size_33 v1.13.cube

Thanks