Have you tried the swapchain-depth=1 thing I quoted here? => Stuttering With New HTPC 1.70 Release - #20 by Mitzsch
I reviewed the logs you provided. Where are they sourced? These are not the application logs I need. You can find them here => “C:\Users\XXXX\AppData\Local\Plex\Logs”
Could you please provide these? 
