I used to pull sumo in the past and had no issues with it. It didn't put a lot of stress on my lower back, basically no stress at all. I used to only get sore glutes/ legs and lats.
Now that I train for strongman I exclusively lift conventional. But it seems to put a lot of stress on my lower and middle back. So my forst question is: "How much" soreness is normal in that areas for conv. Deadlifts (I know that this is a very vague question)? The thhng is I can't really specify if I only experience muscle soreness or if the soreness stems from the spine itself. Probably a combination of both.
The soreness I experience is very uncomfortable during everyday activities.
Informations that might be helpful:
I am 6'2" (188cm), my hip mobily is good as well as my hamstring mobility.
Video for form check (please skip the first 1/3 of the vieo as it only includes power cleans):
As always I am happy for any pointers and helpful suggestions. Thanks in advance.