Youtube on Kodi not playing 1080P 60FPS
If you configured Min bandwidth try with 0.

If you change InputStream Adaptive setting Stream Selection to Manual, you can change Settings - Video settings -> Video stream to a higher resolution manually from the OSD during playback. In Kodi 18 you'll be able to see the stream bandwidth which should help in adjusting your settings as necessary.

If you enable YouTube add-on Settings -> General -> Ask for quality, the first entry should be the dash entry (mpd) and should be labelled with the highest supported quality for that video. 

Other than that will need a debug_log (wiki) to confirm the proxy is working as expected. 

Please follow up at the YouTube Plug-in Thread

Messages In This Thread
RE: Kodi Youtube Addon Not playing 1080P - by anxdpanic - 2018-09-03, 16:17

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