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YouTube should work. When you switched from Simple Choice to ONE you lost the ability to turn Binge OFF, so all video streaming will be decimated to 480p speed. YouTube should be able to do this, on the fly.
P.S. I searched for "YouTube" and found that this is a common complaint. There are some general pointers offered but no clear explanation as to why it happens.
P.P.S. Take a look at this thread.