Are you trying to livestream, or record? Your logfile includes instances of both.
To fix the rendering stalls (or at least help with it), run OBS as Administrator. Normally this happens when the game you're playing is using up all the GPU resources, and OBS can't finish its housekeeping tasks. Running as Admin will let it have 'first dibs' on GPU time.
Encoding lag with NVENC normally is caused by one of four things. Using the Max Quality preset (use Quality instead), or having Lookahead or Psycho-Visual Tuning enabled. Both of those should be unchecked. The last (using a Monitor Capture and Game or Window Capture in the same scene) doesn't appear to apply to you. It might be a good idea to delete the Monitor Capture though, and use a Game or Window capture if possible; they're much more performant. Display Capture should be avoided as anything but an absolute last resort.