It still shows that background DVR is still on, but it doesn't appear to be the actual issue.
You're encountering up to 10% rendering lag, which is a result of OBS not getting enough priority for GPU resources. Turn Game Mode on in windows, and run OBS as administrator (right-click on the program, select "Run as administrator" -- this must be done for every launch).
In addition to this, on the encoding side you're using features that also require extra GPU resources. Turn Look Ahead and Psychovisual tuning both off.