[smf007]

I noticed that it's selecting the lowest video quality by default, and I have to manually change it to the highest. Is there a setting somewhere that controls this?

In the addon settings, if you have if set to "Use FFMPEG" then it should be pulling the highest available stream by default.  If you are using inputstream.adaptive, you'll get the stream that matches you configuration in inputstream.adapative (so some combination of resolution and bitrate).