Timestamped link to where I mention it in my video and show some clips. I did a lot more testing than the clips I included in the video and I never saw a difference in the damage I was taking on any of the 3 handles or a control test without wolfsbane. I made sure to be in combat for a long time before the tests, still no difference. There isn't a visible buff timer for the DR so I think this might be a sign they're simply not proccing.
I think this is worth looking into.
Thanks