Re: Are you interrupting attacks?
Consider, instead of a standard empty-hand yokomen attack, a yokomen cut with a live blade. Or, alternatively, the kind of jo strike that makes the air whistle. Would whatever you are doing still work? If not, you're doing it wrong.
You cannot "block" a live blade or a real jo strike with your bare arm. You *can* take control of the space in such a way as to render the attack harmless.
The difference is left as an exercise for the reader, because I'm terrible at verbal descriptions of technique.