In order for me to actually get above 115 I need the text to not have so many big words in it that I can't spell, and remove a lot of the punctuation. lol
When typing that fast I'm always reading a few words ahead and not thinking about what I am typing. So if I can't spell the word from my own memory it puts a bit of a wrench into it . Mostly I know how a word 'feels' though, and because I have typed that word thousands of times before... it's all just about rhythm.