Canon CLOG to Wide Gamut HLG output process

Hi all, I recently started dipping my toes into HDR footage and I love the look of it (when its not too HDR’ish but still capturing a large dynamic range)One thing I struggle with is a proper workflow with Canon R5 footage in Final Cut Pro, so if anyone can suggest improvements on the below steps or share their process that would be much appreciated.I record footage in 4K, with IPB LIGHT compression (for reduced file sizes, never tested but if the difference is small I’m ok with it), CLOG3, REC709.On my Mac I import the files in my Final Cut Pro library (set as Wide Gamut HDR library). From there on out I create a project and until now I either set the color space to Rec709 or Wide Gamut Rec2020. I feel like I need to utilize the Wide Gamut Rec2020 HLG color space to fully extract range in tones of the footage, but when I do so it darkens the clip, when exporting in HEVC 10-bit 4.2.2 it stays this dark. I recall having tried an export with HDR footage from my iPhone and when exporting in Wide Gamut Rec2020 HLG color space in HEVC 10-bit 4.2.2 format, it displays correct brightness, and plays back nicely on My Mac with XDR display.I am not as experienced with color spaces for video, as with RAW photos you can change the color space in editing, though it might be that footage recorded in Rec709 will not change or export well to Rec2020. So next I want to try changing the color space on my R5 to Cinema Gamut Rec2020 and see if the footage reacts differently when applying the Rec2020 HLG color space to the FCPX Project.Few questions:Is this workflow benefitting the tonal range of my R5 CLOG3 footage or is it minimal compared to exporting the graded footage as HEVC 8-bit 4.2.0 and call it a day? If it is helping considerably, can I go back to my older FCPX libraries, change them to Wide Gamut and export some Rec709 footage to a better looking Rec2020 result in 10-bit output?Can someone explain what is going on with the darkening of the footage when changing the color space to Wide Gamut HLG?Thank you for any insights in the process.Marc