Hey Douglas,
I have also been working in Davinci wide gamut a lot myself lately and have been running into the same issue. I dont know if this will help but this has been my solution thus far, not sure if its entirely correct but I have had good results and more control over my images. I just keep my color space in rec709 and use a cst to convert my image into DWG so that i still have control over the log image since i find it comes in with something crushed from time to time. Like i said im not sure if this is right and if someone has a better workflow for DWG please respond LOL i would love some more perspectives