Thanks for the info @Mark9. In firmware 8.0.0 beta 3, if you go to support.cgi (Login to Web Admin, in the URL bar rename index.cgi to support.cgi then press Enter), you’ll see there is a new “Mitigate bufferbloat” option like this, at the bottom of the page:
Please try it out and let us know your result! 
You can get the new beta firmware here: