You're not doing anythingwrong.
Uncompressed means different things to different people.
4:2:2 is compressed colour space when compared to 4:4:4.
10 bit is compressed when compared to 16 bit.
Even the None codec is 'only' 8 bit
Check out this site:
http://codecs.onerivermedia.com/
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Please post back saying what solved your problem. It could help others, and saying 'thanks' is free!