Very often you think that you perform one song better than another because there is a mindset “I like it more” , I prefer to say “ you like it more , also, your prefrontal cortex works 2-3 times more efficiently when you like something, hence , you motivate yourself and as a result the default system of your brain is activating much more of available resources .. plus trio “mind- muscle system- nervous system” is in a much better coordination ..Some people say “ it’s my vibe”… but there is obviously, more to the story. What is also astonishing, that emotionally wise, we are involved on a very different level and we start actually, to perform.
Please go through your songs.. and try to understand which indeed truly touches you..
There is a strong connection between “ I really like the song” and your great performance. Explore it!