Seems natural that sometimes we're be more eloquent or inventive in dialog, etc., that we are at other times. Like, everyone has "off" days & other days when you amaze yourself.
So, I think a key to keeping consistent is to write ahead of any deadlines so you have time to put new stuff away for a bit & then later read your older & newer material together. Then, I think, you can see where you weren't firing on all cylinders & do some editing so that you like it better.