^ All the You were... performances are up for download throughout the forum, I believe.
(Sorry, I don't have direct links...)
But again - I know I've said this many times, but it's true - don't provide "proof" of her "constant" yelling based on the You were... lives. That song takes a lot of support, especially for somebody with a deep voice (which now applies to Ayumi). Also, it's probably that much harder for somebody who has trouble in that area to begin with, such as Ayu... It's not that she's screaming, it's that she literally has to put everything into it. It doesn't seem like it, but You were... isn't exactly her easiest song.
Also, I just want to point out (again) that sometimes when she's yelling, it's because she's really excited and getting into it, hah. Like, I think it was the last performance of Rule she did, she started to almost scream it, but it's because she was having so much fun.... This also applies to nearly every evolution, Trauma, Boy & Girls, etc. performances, hah.