Same issue here. I swtiched from Davids LEDE build (WRT 1900) to the R7800 with hymnans build but i only get 300 of 400mbps using ethernet. I tried the build from the 16th and 20th of september, no difference. I am not able to max out my internet speed anymore.
With Davids build i could always get the maximum of 400+. Not sure what i am doing wrong here. Wifi is realy good. No latency issues. No addons / settings changed, using standard.
Any ideas what i can tweak with the settings?
//Edit:
This has solved my issues: