^ Interesting how people hear the same things but have different opinions.
I went to the exact same TA 2016 date and thought the vocals were just okay.
You are right about CDL 04-05 - It's one of my favorite countdown lives, but she did lip sync at least Duty and M. She is lip synching to the exact same recording that she used at the Asia Song festival for M.
I would have to say her best vocals that I saw live were in 2005 and 2006. 2007 had a sharp decline and since then I adjusted my expectations. Though she seems to have some random great years at times since then; 2010 and 2015 really stick out as being very vocally strong.