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I've been noticing that certain videos I play through this addon start about 4-5 seconds into the video. The RWBY series is the clearest example as they start partway through the opening themes. Not all RT videos may be prone to this problem, though. This is with "Adjust display refresh rate" off, by the way, and I can't seem to reproduce the issue outside of the RT addon. I've been able reproduce this issue with 17.6 for Windows and Android TV and with 18 RC5 for Xbox.

Debug log, if it helps: https://paste.kodi.tv/qaromavecu

Going back to this issue, A Kodi dev on the bug I filed for this suggested that the addon should use Roosterteeth's master m3u8 playlists, which are supported by inputstream.adaptive. 

The addon already uses a m3u8 playlist. You could try setting up vlc in kodi: https://kodi.wiki/view/External_players to see if that fixes the stuttering...