I tend to enunciate pretty well. It's always seemed that my voice is one of those voices that people can recognize pretty easily - which has been a bit of a drawback for some characters because you're supposed to lose yourself in the character, but sometimes people look at a character and go "Oh, it's 'Weird Al. '"
While you're being creative, nothing is wrong. There's no such thing as a mistake, and any drivel may lead to the breakthrough.