Videos taking an EVEN HUGER quality loss on YOUTUBE

Hi,
I am a music video director shooting on a Canon 60D and editing on FCP 7. Lately I have been noticing that the HD videos I upload on to Youtube are looking a lot blurrier than they used to when played at 360p on YouTube. I haven't changed anything in the way I shoot or export my videos since then and was wondering if anybody could help me figure out why my videos are so blurry on Youtube, even though I'm aware that YOutube downsizes the quality tremendously I just don't understand why the videos are looking blotchier than before..I gave an example of how my videos used to look at 360 when the quality was decent and an example of a more previous blotchy video.

Good Quality 360p
http://www.youtube.com/watch?v=g7cXpdMFXkw

More Recent bad quality 360p
http://www.youtube.com/watch?v=79yLxNJqke4

(Please excuse the vulgarities in this music clip)
 
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