I can’t help with your question sorry. But I am interested that you are doing HDR from CR2 files in DT. When I have tried HDR merges in DT previously I got woeful results and abandoned the idea. I would be interested in seeing a good result.
For me I find that with my CR3 files that picking a single exposure that is ETTR without clipping the highlights gives a better result than any HDR merge using DT or any program. HDR for me was important with JPG images but I find less so with RAW. That is why I am interested in the results you are achieving.
I hope someone can answer your question for you and welcome to the community.